diff --git a/dev-python/hdmf/ChangeLog b/dev-python/hdmf/ChangeLog
new file mode 100644
index 0000000..97a035d
--- /dev/null
+++ b/dev-python/hdmf/ChangeLog
@@ -0,0 +1,4 @@
+*keyrings_alt-4.1.0 (24 Sep 2021)
+
+  24 Sep 2021;  <chymera@gentoo.org> +keyrings_alt-4.1.0.ebuild, +metadata.xml:
+  dev-python/keyrings_alt: new package (DANDI stack)
diff --git a/dev-python/hdmf/Manifest b/dev-python/hdmf/Manifest
new file mode 100644
index 0000000..09f6328
--- /dev/null
+++ b/dev-python/hdmf/Manifest
@@ -0,0 +1 @@
+DIST hdmf-3.1.1.tar.gz 292419 SHA256 d7bdb66eb171592458a6e055fc52203e4ec0d76254e15964261f9cf5f3df9710 SHA512 41776932b1150126a162e9f87072d6626a28bb3f0e05f75337e4f6529c27005ca9db932fdff0c45bb16cbebf68388c7cbf575bbd17950c29c300702a37afacf0 WHIRLPOOL f89d02e2c495f247cfb57cb9c474007b76505ff4c7ed99dfc8eeee2418e8f8b3c31ecf26b30e657b87db7ed6cc9a3882e7efbcded6f625c7f0c45f22e2ab951f
diff --git a/dev-python/hdmf/hdmf-3.1.1.ebuild b/dev-python/hdmf/hdmf-3.1.1.ebuild
new file mode 100644
index 0000000..f20b1f2
--- /dev/null
+++ b/dev-python/hdmf/hdmf-3.1.1.ebuild
@@ -0,0 +1,28 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{8..10} )
+inherit distutils-r1
+
+DESCRIPTION="The Hierarchical Data Modeling Framework"
+HOMEPAGE="https://github.com/hdmf-dev/hdmf"
+SRC_URI="https://github.com/hdmf-dev/hdmf/releases/download/${PV}/${P}.tar.gz -> ${P}.tar.gz"
+
+SLOT="0"
+LICENSE="BSD"
+KEYWORDS="~amd64 ~x86"
+#KEYWORDS="~amd64 ~arm ~arm64 ~x86"
+
+RDEPEND="
+	dev-python/h5py[${PYTHON_USEDEP}]
+	dev-python/jsonschema[${PYTHON_USEDEP}]
+	dev-python/numpy[${PYTHON_USEDEP}]
+	dev-python/pandas[${PYTHON_USEDEP}]
+	dev-python/ruamel-yaml[${PYTHON_USEDEP}]
+	dev-python/scipy[${PYTHON_USEDEP}]
+	"
+BDEPEND=""
+
+distutils_enable_tests pytest
diff --git a/dev-python/hdmf/metadata.xml b/dev-python/hdmf/metadata.xml
new file mode 100644
index 0000000..82da7c4
--- /dev/null
+++ b/dev-python/hdmf/metadata.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>gentoo@chymera.eu</email>
+		<name>Horea Christian</name>
+	</maintainer>
+	<maintainer type="project">
+		<email>sci@gentoo.org</email>
+		<name>Gentoo Science Project</name>
+	</maintainer>
+	<longdescription lang="en">
+		The Hierarchical Data Modeling Framework, or HDMF, is a Python package
+		for working with hierarchical data. It provides APIs for specifying
+		data models, reading and writing data to different storage backends,
+		and representing data with Python object.
+	</longdescription>
+</pkgmetadata>