diff --git a/pkgs/by-name/pr/pretalx/plugins/llm.nix b/pkgs/by-name/pr/pretalx/plugins/llm.nix
new file mode 100644
index 000000000000..bb043355a8e9
--- /dev/null
+++ b/pkgs/by-name/pr/pretalx/plugins/llm.nix
@@ -0,0 +1,50 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  numpy,
+  ollama,
+  openai,
+  python-redis-lock,
+  umap-learn,
+}:
+
+buildPythonPackage rec {
+  pname = "pretalx-llm";
+  version = "0.5.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "why2025-datenzone";
+    repo = "pretalx-llm";
+    rev = "v${version}";
+    hash = "sha256-Ga6Itvc+yL+p6K7w6WYTeNfxahaohDidDWnt0GtcWEM=";
+  };
+
+  build-system = [
+    setuptools
+  ];
+
+  dependencies = [
+    numpy
+    ollama
+    openai
+    python-redis-lock
+    umap-learn
+  ];
+
+  doCheck = false; # no tests
+
+  pythonImportsCheck = [
+    "pretalx_llm"
+  ];
+
+  meta = {
+    description = "LLM support for Pretalx";
+    homepage = "https://github.com/why2025-datenzone/pretalx-llm";
+    changelog = "https://github.com/why2025-datenzone/pretalx-llm/blob/${src.rev}/CHANGELOG.md";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}
diff --git a/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix b/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix
new file mode 100644
index 000000000000..ebf021068bd1
--- /dev/null
+++ b/pkgs/by-name/pr/pretalx/plugins/openmetrics.nix
@@ -0,0 +1,40 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  unstableGitUpdater,
+}:
+
+buildPythonPackage {
+  pname = "pretalx-openmetrics";
+  version = "unstable-2025-05-25";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "why2025-datenzone";
+    repo = "pretalx-openmetrics";
+    rev = "1121a5d430c403bc9aedb7ae8b1aa81219c8a58f";
+    hash = "sha256-reQA61JFZsYWE/CAL28Oe60CmGANt0phXLzz9YGtDYQ=";
+  };
+
+  build-system = [
+    setuptools
+  ];
+
+  doCheck = false; # no tests
+
+  pythonImportsCheck = [
+    "pretalx_openmetrics"
+  ];
+
+  # no tagged release yet
+  passthru.updateScript = unstableGitUpdater { };
+
+  meta = {
+    description = "OpenMetrics instrumentation plugin";
+    homepage = "https://github.com/why2025-datenzone/pretalx-openmetrics";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}
diff --git a/pkgs/by-name/pr/pretalx/plugins/zammad.nix b/pkgs/by-name/pr/pretalx/plugins/zammad.nix
new file mode 100644
index 000000000000..72f7ff9e6c4c
--- /dev/null
+++ b/pkgs/by-name/pr/pretalx/plugins/zammad.nix
@@ -0,0 +1,41 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  setuptools,
+  zammad-py,
+}:
+
+buildPythonPackage rec {
+  pname = "pretalx-zammad";
+  version = "2025.0.1";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "badbadc0ffee";
+    repo = "pretalx-zammad";
+    tag = "v${version}";
+    hash = "sha256-YIKZO04vaKPGhUrTFiE4F+KjuBrYm0KsxUua5+Hm7gg=";
+  };
+
+  build-system = [
+    setuptools
+  ];
+
+  dependencies = [
+    zammad-py
+  ];
+
+  doCheck = false; # no tests
+
+  pythonImportsCheck = [
+    "pretalx_zammad"
+  ];
+
+  meta = {
+    description = "Pretalx plugin for Zammad issue tracker";
+    homepage = "https://github.com/badbadc0ffee/pretalx-zammad";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}
diff --git a/pkgs/development/python-modules/zammad-py/default.nix b/pkgs/development/python-modules/zammad-py/default.nix
new file mode 100644
index 000000000000..656c153ac682
--- /dev/null
+++ b/pkgs/development/python-modules/zammad-py/default.nix
@@ -0,0 +1,53 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  poetry-core,
+  requests,
+  pytestCheckHook,
+}:
+
+buildPythonPackage rec {
+  pname = "zammad-py";
+  version = "3.2.0";
+  pyproject = true;
+
+  src = fetchFromGitHub {
+    owner = "joeirimpan";
+    repo = "zammad_py";
+    tag = "v${version}";
+    hash = "sha256-gU5OA5m8X03GM7ImXZZVLkEyoAXRCoFskfop8oXJFH0=";
+  };
+
+  build-system = [
+    poetry-core
+  ];
+
+  dependencies = [
+    requests
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+  ];
+
+  disabledTests = [
+    # requires a local zammad instance
+    "test_users"
+    "test_tickets"
+    "test_groups"
+    "test_pagination"
+  ];
+
+  pythonImportsCheck = [
+    "zammad_py"
+  ];
+
+  meta = {
+    changelog = "https://github.com/joeirimpan/zammad_py/blob/${src.tag}/HISTORY.rst";
+    description = "Python API client for accessing zammad REST API";
+    homepage = "https://github.com/joeirimpan/zammad_py";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ hexa ];
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e7f64b2eaa2b..68a80e0a1055 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -19741,6 +19741,8 @@ self: super: with self; {
 
   zamg = callPackage ../development/python-modules/zamg { };
 
+  zammad-py = callPackage ../development/python-modules/zammad-py { };
+
   zarr = callPackage ../development/python-modules/zarr { };
 
   zc-buildout = callPackage ../development/python-modules/zc-buildout { };