diff --git a/pkgs/by-name/je/jello-lang/package.nix b/pkgs/by-name/je/jello-lang/package.nix
new file mode 100644
index 000000000000..38ed8612c932
--- /dev/null
+++ b/pkgs/by-name/je/jello-lang/package.nix
@@ -0,0 +1,51 @@
+{
+  lib,
+  python3Packages,
+  fetchFromGitHub,
+  fetchpatch2,
+  jellyfish,
+  nix-update-script,
+}:
+
+python3Packages.buildPythonApplication {
+  pname = "jello-lang";
+  version = "0-unstable-2025-01-07";
+  format = "pyproject";
+
+  src = fetchFromGitHub {
+    owner = "codereport";
+    repo = "jello";
+    rev = "462c48d0613d3ef5e2c2c9771b3db64f0747ac89";
+    hash = "sha256-5pyJYV6UITtsjHUsyqdiyTXw3dK1ibZQpi8Z3E/L+xo=";
+  };
+
+  patches = [
+    (fetchpatch2 {
+      # https://github.com/codereport/jello/pull/43
+      url = "https://github.com/codereport/jello/commit/16ea477b302a810d161303539c4145130b90544c.patch";
+      hash = "sha256-6ZbytV6jUPAoPbV4IAbP5YsgPcjZZ+chGo3Z1h3hg1E=";
+    })
+  ];
+
+  build-system = [ python3Packages.setuptools ];
+
+  dependencies = [
+    python3Packages.colorama
+    python3Packages.prompt-toolkit
+  ];
+
+  # there are no tests
+  doCheck = false;
+
+  makeWrapperArgs = [ "--suffix PATH : ${lib.makeBinPath [ jellyfish ]}" ];
+
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version=branch" ]; };
+
+  meta = {
+    description = "Wrapper for Jellyfish (a fork of the Jelly programming language)";
+    homepage = "https://github.com/codereport/jello";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ defelo ];
+    mainProgram = "jello";
+  };
+}
diff --git a/pkgs/by-name/je/jellyfish/package.nix b/pkgs/by-name/je/jellyfish/package.nix
new file mode 100644
index 000000000000..99613f9960db
--- /dev/null
+++ b/pkgs/by-name/je/jellyfish/package.nix
@@ -0,0 +1,36 @@
+{
+  lib,
+  python3Packages,
+  fetchFromGitHub,
+  nix-update-script,
+}:
+
+python3Packages.buildPythonApplication {
+  pname = "jellyfish";
+  version = "0-unstable-2024-05-27";
+  format = "pyproject";
+
+  src = fetchFromGitHub {
+    owner = "codereport";
+    repo = "jellyfish";
+    rev = "611fdf45c8950dfc06d22c2638aa73f9560203b4";
+    hash = "sha256-IwqXR7oeQjFV4MGadqg1Y6a5tUYb3MdT2L6kDs5JvTo=";
+  };
+
+  build-system = [ python3Packages.setuptools ];
+
+  dependencies = [ python3Packages.sympy ];
+
+  # there are no tests
+  doCheck = false;
+
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version=branch" ]; };
+
+  meta = {
+    description = "Extension of the Jelly programming language created by Dennis Mitchell";
+    homepage = "https://github.com/codereport/jellyfish";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ defelo ];
+    mainProgram = "jelly";
+  };
+}