diff --git a/swh/lister/__init__.py b/swh/lister/__init__.py
--- a/swh/lister/__init__.py
+++ b/swh/lister/__init__.py
@@ -30,6 +30,26 @@
 
 SUPPORTED_LISTERS = list(LISTERS)
 
+# to recognize existing naming pattern
+TARBALL_EXTENSIONS = [
+    "jar",
+    "zip",
+    "tar",
+    "gz",
+    "tgz",
+    "tbz",
+    "bz2",
+    "bzip2",
+    "lzma",
+    "lz",
+    "txz",
+    "xz",
+    "z",
+    "Z",
+    "7z",
+    "zst",
+]
+
 
 def get_lister(lister_name, db_url=None, **conf):
     """Instantiate a lister given its name.
diff --git a/swh/lister/gnu/tree.py b/swh/lister/gnu/tree.py
--- a/swh/lister/gnu/tree.py
+++ b/swh/lister/gnu/tree.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2019-2021 The Software Heritage developers
+# Copyright (C) 2019-2022 The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
@@ -15,6 +15,8 @@
 
 import requests
 
+from swh.lister import TARBALL_EXTENSIONS
+
 logger = logging.getLogger(__name__)
 
 
@@ -186,21 +188,6 @@
     return False
 
 
-# to recognize existing naming pattern
-EXTENSIONS = [
-    "zip",
-    "tar",
-    "gz",
-    "tgz",
-    "bz2",
-    "bzip2",
-    "lzma",
-    "lz",
-    "xz",
-    "Z",
-    "7z",
-]
-
 VERSION_KEYWORDS = [
     "cygwin_me",
     "w32",
@@ -269,7 +256,7 @@
 (?P<extension>(?:\.(?:{extensions}))+)
 $
 """.format(
-    extensions="|".join(EXTENSIONS),
+    extensions="|".join(TARBALL_EXTENSIONS),
     vkeywords="|".join("%s[-]?" % k for k in VERSION_KEYWORDS),
 )
 
diff --git a/swh/lister/nixguix/__init__.py b/swh/lister/nixguix/__init__.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/nixguix/__init__.py
@@ -0,0 +1,12 @@
+# Copyright (C) 2022 the Software Heritage developers
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+
+def register():
+    from .lister import NixGuixLister
+
+    return {
+        "lister": NixGuixLister,
+        "task_modules": ["%s.tasks" % __name__],
+    }
diff --git a/swh/lister/nixguix/lister.py b/swh/lister/nixguix/lister.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/nixguix/lister.py
@@ -0,0 +1,291 @@
+# Copyright (C) 2020-2022  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from dataclasses import dataclass
+import logging
+from pathlib import Path
+import random
+from typing import Any, Callable, Dict, Iterator, List, Optional, Tuple, Union
+
+import requests
+
+from swh.core.github.utils import GitHubSession
+from swh.lister import TARBALL_EXTENSIONS, USER_AGENT
+from swh.lister.pattern import CredentialsType, StatelessLister
+from swh.scheduler.model import ListedOrigin
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class OriginUpstream:
+    """Upstream origin (e.g. NixOS/nixpkgs, Guix/Guix)."""
+
+    url: str
+    version: int
+    revision: str
+
+
+@dataclass
+class Tarball:
+    """Metadata information on Tarball."""
+
+    urls: List[str]
+    """List of urls to retrieve the tarball artifact."""
+    integrity: str
+    """Integrity hash of the tarball."""
+
+
+@dataclass
+class File:
+    """Metadata information on File."""
+
+    urls: List[str]
+    """List of urls to retrieve the file artifact."""
+    integrity: str
+    """Integrity hash of the file."""
+
+
+@dataclass
+class DVCS:
+    """Metadata information on DVCS."""
+
+    origin: str
+    """Origin url of the dvcs"""
+    ref: Optional[str]
+    """Reference either a svn commit id, a git commit, ..."""
+    type: str
+    """Type of (d)vcs, e.g. svn, git, hg, ..."""
+
+
+ArtifactTypes = Union[Tarball, File, DVCS, OriginUpstream]
+PageResult = Tuple[str, ArtifactTypes]
+
+
+DVCS_SUPPORTED = ("git", "svn", "hg")
+
+
+def is_tarball(urls: List[str]) -> bool:
+    """Determine whether a list of files actually are tarballs or simple files.
+
+    Args:
+        urls: name of the remote files for which the extensions needs to be
+          checked.
+
+    Returns:
+        Whether filename is an archive or not
+
+    Example:
+
+    >>> is_tarball(['abc.zip'])
+    True
+    >>> is_tarball(['one.tar.gz', 'two.tgz'])
+    True
+    >>> is_tarball(['abc.c', 'other.c'])
+    False
+
+    """
+    index = random.randrange(len(urls))
+    filepath = urls[index]
+    file_suffix = Path(filepath).suffixes[-1].lstrip(".")
+    return file_suffix in TARBALL_EXTENSIONS
+
+
+class NixGuixLister(StatelessLister[PageResult]):
+    """List Guix or Nix sources out of a public json manifest.
+
+    This lister can output:
+    - tarballs (.tar.gz, .tbz2, ...)
+    - dvcs repositories (e.g. git, hg, svn)
+    - files (.lisp, .py, ...)
+
+    Note that no `last_update` is available in either manifest.
+
+    """
+
+    LISTER_NAME = "NixGuixLister"
+
+    def __init__(
+        self,
+        scheduler,
+        url: str,
+        origin_upstream: str,
+        name: Optional[str] = "nixpkgs",
+        instance: Optional[str] = None,
+        credentials: Optional[CredentialsType] = None,
+        **kwargs: Any,
+    ):
+        super().__init__(
+            scheduler=scheduler,
+            url=url.rstrip("/"),
+            instance=instance,
+            credentials=credentials,
+        )
+        # either full fqdn NixOS/nixpkgs or guix repository urls
+        # maybe add an assert on those specific urls?
+        self.origin_upstream = origin_upstream
+
+        self.session = requests.Session()
+        self.session.headers.update(
+            {"Accept": "application/json", "User-Agent": USER_AGENT}
+        )
+        self.github_session = GitHubSession(
+            credentials=self.credentials, user_agent=USER_AGENT
+        )
+
+    def get_pages(self) -> Iterator[PageResult]:
+        """Yield one page per "typed" origin referenced in manifest."""
+        dvcs_keys = {
+            "git": {
+                "ref": "git_ref",
+                "url": "git_url",
+            },
+            "svn": {
+                "ref": "svn_revision",
+                "url": "svn_url",
+            },
+            "hg": {
+                "ref": "hg_changeset",
+                "url": "hg_url",
+            },
+        }
+        # fetch the manifest to parse...
+        response = self.session.get(self.url, allow_redirects=True)
+        if response.status_code != 200:
+            logger.warning(
+                "Unexpected HTTP status code %s on %s: %s",
+                response.status_code,
+                response.url,
+                response.content,
+            )
+        response.raise_for_status()
+
+        # ... if any
+        raw_data = response.json()
+        version = raw_data["version"]
+        revision = raw_data["revision"]
+        yield "origin", OriginUpstream(
+            self.origin_upstream,
+            version,
+            revision,
+        )
+
+        # grep '"type"' guix-sources.json | sort | uniq
+        #       "type": false                             <<<<<<<<< noise
+        #       "type": "git",
+        #       "type": "hg",
+        #       "type": "no-origin",                      <<<<<<<<< noise
+        #       "type": "svn",
+        #       "type": "url",
+
+        # grep '"type"' nixpkgs-sources-unstable.json | sort | uniq
+        #  "type": "url",
+
+        for artifact in raw_data["sources"]:
+            artifact_type = artifact["type"]
+            if artifact_type in DVCS_SUPPORTED:
+                plain_url = artifact[dvcs_keys[artifact_type]["url"]]
+                plain_ref = artifact[dvcs_keys[artifact_type]["ref"]]
+                artifact_url = self.github_session.get_canonical_url(plain_url)
+                if not artifact_url:
+                    continue
+                yield "dvcs", DVCS(
+                    origin=artifact_url, type=artifact_type, ref=plain_ref
+                )
+            elif artifact_type == "url":
+                # It's either a tarball or a file
+                urls = artifact.get("urls")
+                if not urls:
+                    # Nothing to fetch
+                    logger.warning("Skipping empty artifact %s", artifact)
+                    continue
+
+                assert urls is not None
+                integrity = artifact["integrity"]
+
+                if is_tarball(urls):
+                    yield "tarball", Tarball(urls=urls, integrity=integrity)
+                else:
+                    yield "file", File(urls=urls, integrity=integrity)
+            else:
+                logger.warning(
+                    "Skipping unsupported type %s for artifact %s",
+                    artifact_type,
+                    artifact,
+                )
+
+    def from_dvcs_to_listed_origin(self, artifact: DVCS) -> Iterator[ListedOrigin]:
+        """Given a dvcs repository, yield a ListedOrigin."""
+        assert self.lister_obj.id is not None
+        # FIXME: What to do with the "ref" (e.g. git/hg/svn commit, ...)
+        yield ListedOrigin(
+            lister_id=self.lister_obj.id,
+            url=artifact.origin,
+            visit_type=artifact.type,
+        )
+
+    def from_origin_to_listed_origin(
+        self, origin_upstream: OriginUpstream
+    ) -> Iterator[ListedOrigin]:
+        """Given an upstream origin, yield a ListedOrigin."""
+        assert self.lister_obj.id is not None
+        yield ListedOrigin(
+            lister_id=self.lister_obj.id,
+            url=origin_upstream.url,
+            visit_type="git",  # both nixpkgs and guix are git origins so far
+        )
+
+    def from_tarball_to_listed_origin(self, tarball: Tarball) -> Iterator[ListedOrigin]:
+        """Given a tarball, yield as many ListedOrigin as tarball urls."""
+        # FIXME: maybe check or filter according to file extensions
+        assert self.lister_obj.id is not None
+        for url in tarball.urls:
+            yield ListedOrigin(
+                lister_id=self.lister_obj.id,
+                url=url,
+                visit_type="tar",
+                extra_loader_arguments={
+                    "artifacts": [
+                        {
+                            "url": url,
+                        }
+                    ],
+                    "extid_manifest_format": "$url $integrity",
+                    "integrity": tarball.integrity,
+                },
+            )
+
+    def from_file_to_listed_origin(self, simplefile: File) -> Iterator[ListedOrigin]:
+        """Given a remote file, yield a ListedOrigin."""
+        # FIXME: Actually same implem. as tarball, so do we need to separate those?
+        assert self.lister_obj.id is not None
+        for url in simplefile.urls:
+            yield ListedOrigin(
+                lister_id=self.lister_obj.id,
+                url=url,
+                visit_type="file",
+                extra_loader_arguments={
+                    "artifacts": [
+                        {
+                            "url": url,
+                        }
+                    ],
+                    "extid_manifest_format": "$url $integrity",
+                    "integrity": simplefile.integrity,
+                },
+            )
+
+    def get_origins_from_page(
+        self, artifact_tuple: PageResult
+    ) -> Iterator[ListedOrigin]:
+        """Given an artifact tuple (type, artifact), yield a ListedOrigin."""
+        artifact_type, artifact = artifact_tuple
+        mapping_type_to_fn: Dict[str, Callable[[Any], Iterator[ListedOrigin]]] = {
+            "dvcs": self.from_dvcs_to_listed_origin,
+            "file": self.from_file_to_listed_origin,
+            "origin": self.from_origin_to_listed_origin,
+            "tarball": self.from_tarball_to_listed_origin,
+        }
+        yield from mapping_type_to_fn[artifact_type](artifact)
diff --git a/swh/lister/nixguix/tests/__init__.py b/swh/lister/nixguix/tests/__init__.py
new file mode 100644
diff --git a/swh/lister/nixguix/tests/data/guix-swh_sources.json b/swh/lister/nixguix/tests/data/guix-swh_sources.json
new file mode 100644
--- /dev/null
+++ b/swh/lister/nixguix/tests/data/guix-swh_sources.json
@@ -0,0 +1,10 @@
+{
+  "sources": [
+    {"type": "git", "git_url": "", "git_ref": ""},
+    {"type": false},
+    {"type": "no-origin"},
+    {"type": "url", "urls": []}
+  ],
+  "version":"1",
+  "revision":"ab59155c5a38dda7efaceb47c7528578fcf0def4"
+}
diff --git a/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json b/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json
new file mode 100644
--- /dev/null
+++ b/swh/lister/nixguix/tests/data/nixpkgs-swh_sources.json
@@ -0,0 +1,52 @@
+{
+  "sources": [
+    {
+      "type": "url",
+      "urls": [ "https://github.com/owner-1/repository-1/revision-1.tgz" ],
+      "integrity": "sha256-3vm2Nt+O4zHf3Ovd/qsv1gKTEUwodX9FLxlrQdry0zs="
+    },
+    {
+      "type": "url",
+      "urls": [ "https://github.com/owner-3/repository-1/revision-1.tgz" ],
+      "integrity": "sha256-3vm2Nt+O4zHf3Ovd/qsv1gKTEUwodX9FLxlrQdry0zs="
+    },
+    {
+      "type": "url",
+      "urls": [ "https://example.com/file.txt" ],
+      "integrity": "sha256-Q0copBCnj1b8G1iZw1k0NuYasMcx6QctleltspAgXlM="
+    },
+    {
+      "type": "url",
+      "urls": [
+        "https://releases.wildfiregames.com/0ad-0.0.25b-alpha-unix-build.tar.xz"
+      ],
+      "integrity": "sha256-1w3NdfRzp9XIFDLD2SYJJr+Nnf9c1UF5YWlJfRxSLt0="
+    },
+    {
+      "type": "url",
+      "urls": [
+        "http://downloads.sourceforge.net/project/nmon/lmon16n.c",
+        "http://ufpr.dl.sourceforge.net/project/nmon/lmon16n.c",
+        "http://netassist.dl.sourceforge.net/project/nmon/lmon16n.c"
+      ],
+      "integrity": "sha256-wAEswtkl3ulAw3zq4perrGS6Wlww5XXnQYsEAoYT9fI="
+    },
+    {
+      "type": "git",
+      "git_url": "https://example.org/pali/0xffff",
+      "git_ref": "0.9"
+    },
+    {
+      "type": "hg",
+      "hg_url": "https://example.org/vityok/cl-string-match",
+      "hg_changeset": "5048480a61243e6f1b02884012c8f25cdbee6d97"
+    },
+    {
+      "type": "svn",
+      "svn_url": "https://code.call-cc.org/svn/chicken-eggs/release/5/iset/tags/2.2",
+      "svn_revision": 39057
+    }
+  ],
+  "version": "1",
+  "revision": "cc4e04c26672dd74e5fd0fecb78b435fb55368f7"
+}
diff --git a/swh/lister/nixguix/tests/test_lister.py b/swh/lister/nixguix/tests/test_lister.py
new file mode 100644
--- /dev/null
+++ b/swh/lister/nixguix/tests/test_lister.py
@@ -0,0 +1,126 @@
+# Copyright (C) 2022 The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+from collections import defaultdict
+import json
+import logging
+from pathlib import Path
+from typing import Dict, List
+
+import pytest
+import requests
+
+from swh.lister import USER_AGENT
+from swh.lister.nixguix.lister import NixGuixLister
+from swh.lister.pattern import ListerStats
+
+logger = logging.getLogger(__name__)
+
+
+def _match_request(request):
+    return request.headers.get("User-Agent") == USER_AGENT
+
+
+def page_response(datadir, instance: str) -> List[Dict]:
+    """Return list of repositories (out of test dataset)"""
+    datapath = Path(datadir, f"{instance}-swh_sources.json")
+    return json.loads(datapath.read_text()) if datapath.exists else []
+
+
+def test_lister_nixguix(datadir, swh_scheduler, requests_mock):
+    """NixGuixLister should list all origins per visit type"""
+    instance = "nixpkgs"
+    url = "https://nix-community.github.io/nixpkgs-swh/sources-unstable.json"
+    origin_upstream = "https://github.com/NixOS/nixpkgs"
+    lister = NixGuixLister(swh_scheduler, url=url, origin_upstream=origin_upstream)
+
+    response = page_response(datadir, instance)
+
+    requests_mock.get(
+        url,
+        [{"json": response}],
+        additional_matcher=_match_request,
+    )
+
+    listed_result = lister.run()
+    expected_nb_origins = 1  # origin upstream is an origin as well
+    for source in response["sources"]:
+        if source["type"] == "url":
+            # for typed artifact "url", each url referenced is one new origin
+            expected_nb_origins += len(source["urls"])
+        else:
+            expected_nb_origins += 1
+
+    nb_pages = (
+        len(response["sources"]) + 1
+    )  # each origin read is one page + the upstream origin
+    assert listed_result == ListerStats(pages=nb_pages, origins=expected_nb_origins)
+
+    scheduler_origins = lister.scheduler.get_listed_origins(
+        lister.lister_obj.id
+    ).results
+    assert len(scheduler_origins) == expected_nb_origins
+
+    mapping_visit_types = defaultdict(int)
+
+    for listed_origin in scheduler_origins:
+        assert listed_origin.visit_type in ["file", "git", "svn", "hg", "tar"]
+        # no last update is listed on those manifests
+        assert listed_origin.last_update is None
+
+        mapping_visit_types[listed_origin.visit_type] += 1
+
+    assert dict(mapping_visit_types) == {
+        "git": 1 + 1,  # origin_upstream again
+        "svn": 1,
+        "hg": 1,
+        "tar": 3,
+        "file": 4,
+    }
+
+
+def test_lister_nixguix_mostly_noop(datadir, swh_scheduler, requests_mock):
+    """NixGuixLister should ignore unsupported or incomplete origins"""
+    instance = "guix"
+    url = "https://guix.gnu.org/sources.json"
+    origin_upstream = "https://git.savannah.gnu.org/git/guix.git"
+    lister = NixGuixLister(swh_scheduler, url=url, origin_upstream=origin_upstream)
+
+    response = page_response(datadir, instance)
+
+    requests_mock.get(
+        url,
+        [{"json": response}],
+        additional_matcher=_match_request,
+    )
+
+    listed_result = lister.run()
+    # only the origin upstream is listed, every other entries are unsupported or incomplete
+    assert listed_result == ListerStats(pages=1, origins=1)
+
+    scheduler_origins = lister.scheduler.get_listed_origins(
+        lister.lister_obj.id
+    ).results
+    assert len(scheduler_origins) == 1
+
+    assert scheduler_origins[0].visit_type == "git"
+
+
+def test_lister_nixguix_fail(datadir, swh_scheduler, requests_mock):
+    url = "https://nix-community.github.io/nixpkgs-swh/sources-unstable.json"
+    origin_upstream = "https://github.com/NixOS/nixpkgs"
+    lister = NixGuixLister(swh_scheduler, url=url, origin_upstream=origin_upstream)
+
+    requests_mock.get(
+        url,
+        status_code=404,
+        additional_matcher=_match_request,
+    )
+
+    with pytest.raises(requests.HTTPError):  # listing cannot continues so stop
+        lister.run()
+
+    scheduler_origins = swh_scheduler.get_listed_origins(lister.lister_obj.id).results
+    assert len(scheduler_origins) == 0