diff --git a/captcha/default.nix b/captcha/default.nix
new file mode 100644
index 0000000..6395547
--- /dev/null
+++ b/captcha/default.nix
@@ -0,0 +1,18 @@
+{ lib, buildPythonPackage, fetchPypi,
+  pillow, nose }:
+
+buildPythonPackage rec {
+  pname = "captcha";
+  version = "0.3";
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256:1ql38qnrn43s9i3z4cq1ji2jcsz3g1cj4w2y8527r8z01l98mcm6";
+  };
+  propagatedBuildInputs = [ pillow ];
+  checkInputs = [ nose ];
+  meta = {
+    description = "A captcha library that generates audio and image CAPTCHAs.";
+    maintainers = with lib.maintainers; [ schmittlauch ]; 
+    license = lib.licenses.bsd3;
+  };
+}
diff --git a/default.nix b/default.nix
index c223113..9deb288 100644
--- a/default.nix
+++ b/default.nix
@@ -1,13 +1,16 @@
 self: super: rec {
   libevhtp = super.callPackage ./libevhtp/default.nix {};
   libsearpc = super.callPackage ./libsearpc/default.nix {};
-  seafile-server = super.callPackage ./seafile-server/default.nix { inherit libevhtp python27Packages libsearpc;};
-  python27Packages = super.python27Packages // rec {
-    django-jsonfield = super.python27Packages.callPackage ./django-jsonfield/default.nix {};
-    jsonfield = super.python27Packages.callPackage ./jsonfield/default.nix {};
-    django-post_office = super.python27Packages.callPackage ./django-post_office/default.nix { inherit jsonfield; };
-    django-statici18n = super.python27Packages.callPackage ./django-statici18n/default.nix {};
-    seafile-bindings = super.python27Packages.toPythonModule seafile-server.seafile-server-core;
-    ccnet-bindings = super.python27Packages.toPythonModule seafile-server.ccnet-server;
+  seafile-server = super.callPackage ./seafile-server/default.nix { inherit libevhtp python3Packages libsearpc;};
+  python3Packages = super.python3Packages // rec {
+    jsonfield = super.python3Packages.callPackage ./jsonfield {};
+    django-simple-captcha = super.python3Packages.callPackage ./django-simple-captcha { inherit django-ranged-response; };
+    django-ranged-response = super.python3Packages.callPackage ./django-ranged-response {};
+    django-post_office = super.python3Packages.callPackage ./django-post_office { inherit jsonfield; };
+    django-statici18n = super.python3Packages.callPackage ./django-statici18n {};
+    captcha = super.python3Packages.callPackage ./captcha {};
+    django-formtools = super.python3Packages.callPackage ./django-formtools {};
+    seafile-bindings = super.python3Packages.toPythonModule seafile-server.seafile-server-core;
+    ccnet-bindings = super.python3Packages.toPythonModule seafile-server.ccnet-server;
   };
 }
diff --git a/django-formtools/default.nix b/django-formtools/default.nix
new file mode 100644
index 0000000..93c1b8e
--- /dev/null
+++ b/django-formtools/default.nix
@@ -0,0 +1,19 @@
+{ lib, buildPythonPackage, fetchPypi,
+  django }:
+
+buildPythonPackage rec {
+  pname = "django-formtools";
+  version = "2.2";
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256:1chkbl188yj6hvhh1wgjpfgql553k6hrfwxzb8vv4lfdq41jq9y5";
+  };
+  propagatedBuildInputs = [ django ];
+  doCheck = false;  # TODO: fix tests
+  checkInputs = [ django ];
+  meta = {
+    description = "a collection of assorted utilities that are useful for specific form use cases.";
+    maintainers = with lib.maintainers; [ schmittlauch ]; 
+    license = lib.licenses.bsd3;
+  };
+}
diff --git a/django-ranged-response/default.nix b/django-ranged-response/default.nix
new file mode 100644
index 0000000..f959016
--- /dev/null
+++ b/django-ranged-response/default.nix
@@ -0,0 +1,23 @@
+{ stdenv, fetchurl, fetchPypi, buildPythonPackage, django }:
+
+buildPythonPackage rec {
+  pname = "django-ranged-response";
+  version = "0.2.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "11gr3jpmb5rvg3scv026kjwwkmnxwivgq5ypxadnnc9p58szy7zp";
+  };
+
+  # tests not included in PyPi package, github source is not up to date with 0.2.0
+  doCheck = false;
+
+  propagatedBuildInputs = [ django ];
+
+  meta = with stdenv.lib; {
+    description = "A modified FileResponse that returns `Content-Range` headers with the HTTP response, so browsers (read Safari 9+) that request the file, can stream the response properly";
+    homepage = "https://github.com/wearespindle/django-ranged-fileresponse";
+    license = licenses.mit;
+    maintainers = with maintainers; [ mrmebelman schmittlauch ];
+  };
+}
diff --git a/django-simple-captcha/default.nix b/django-simple-captcha/default.nix
new file mode 100644
index 0000000..618ebd5
--- /dev/null
+++ b/django-simple-captcha/default.nix
@@ -0,0 +1,30 @@
+{ lib, buildPythonPackage, fetchPypi, python, six, testfixtures,
+django, django-ranged-response, pillow,
+withTTS ? true, flite }:
+
+buildPythonPackage rec {
+  pname = "django-simple-captcha";
+  version = "0.5.12";
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256:1g92sdgcb81r3il34pg0z210cz6wm14k00b558nshai8br1g09gw";
+    extension = "zip";
+  };
+  # ToDo: fix tests
+  doCheck = false;
+  checkInputs = [ testfixtures ];
+  checkPhase = ''
+    cd testproject
+    ${python.interpreter} manage.py test captcha
+  '';
+
+  propagatedBuildInputs = [ django django-ranged-response six pillow ]
+    ++ lib.optional withTTS flite;
+
+  meta = with lib; {
+    description = "An extremely simple, yet highly customizable Django application to add captcha images to any Django form";
+    homepage = "https://github.com/mbi/django-simple-captcha";
+    license = licenses.mit;
+    maintainers = with maintainers; [ mrmebelman schmittlauch ];
+  };
+}