diff --git a/common.nix b/common.nix
index 1c81a2e..cb632ff 100644
--- a/common.nix
+++ b/common.nix
@@ -106,6 +106,7 @@
   # Enable CUPS to print documents.
   services.avahi.enable = true; # cups browsing support
   services.printing.enable = true;
+  services.colord.enable = true;
 
   # IntelliJ
   boot.kernel.sysctl."fs.inotify.max_user_watches" = 524288;
diff --git a/pkgs/pdfpc.nix b/pkgs/pdfpc.nix
new file mode 100644
index 0000000..e4a45a3
--- /dev/null
+++ b/pkgs/pdfpc.nix
@@ -0,0 +1,16 @@
+with import <nixpkgs> {};
+stdenv.mkDerivation rec {
+  name = "pdfpc-${version}";
+  version = "2015-04-16";
+
+  # fetchFromGitHub doesn't include submodules
+  src = fetchgit {
+    url = "https://github.com/pdfpc/pdfpc.git";
+    rev = "c85ecfbf20050715393f5874124be49853a5e80e";
+    sha256 = "1gb0vn60f81wwz0g9ivacdiqbs5n2d64axr1pd0f3wp7mrwm34pp";
+  };
+
+  buildInputs = [ cmake gtk2 poppler librsvg vala
+      pkgconfig gstreamer gst_plugins_base gnome3.libgee epoxy ]
+    ++ (with xlibs; [ libxcb libXdmcp libpthreadstubs libxshmfence libxkbcommon ]);
+}
diff --git a/pkgs/qalc-gtk.nix b/pkgs/qalc-gtk.nix
new file mode 100644
index 0000000..886191e
--- /dev/null
+++ b/pkgs/qalc-gtk.nix
@@ -0,0 +1,22 @@
+# { stdenv, fetchurl, cln, libxml2, glib, intltool, pkgconfig }:
+with import <nixpkgs> {};
+
+stdenv.mkDerivation rec {
+  name = "qalculate-gtk-${version}";
+  version = "0.9.7";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/qalculate/${name}.tar.gz";
+    sha256 = "0b986x5yny9vrzgxlbyg80b23mxylxv2zz8ppd9svhva6vi8xsm4";
+  };
+
+  nativeBuildInputs = [ intltool pkgconfig ];
+  buildInputs = [ libqalculate gtk gnome2.libglade gnome2.libgnome gnome2.scrollkeeper ];
+
+  meta = {
+    description = "The ultimate desktop calculator";
+    homepage = http://qalculate.sourceforge.net;
+    maintainers = [ stdenv.lib.maintainers.gebner ];
+    platforms = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/qmaxsat.nix b/pkgs/qmaxsat.nix
new file mode 100644
index 0000000..40d48b0
--- /dev/null
+++ b/pkgs/qmaxsat.nix
@@ -0,0 +1,19 @@
+with import <nixpkgs> {};
+stdenv.mkDerivation rec {
+  name = "qmaxsat-${version}";
+  version = "14.04";
+
+  src = fetchurl {
+    url = https://sites.google.com/site/qmaxsat/maxsat2014-1/qmaxsat14.04auto-glucose3_static;
+    sha256 = "08dbcm473kxm13g0dli2aaqha26a1yy218y1jff2zval4i4wx10m";
+  };
+
+  unpackCmd = ''
+    mkdir src/
+    cp $src src/qmaxsat-bin
+  '';
+
+  installPhase = ''
+    install -D -m0755 qmaxsat* $out/bin/qmaxsat
+  '';
+}
diff --git a/pkgs/yourkit.nix b/pkgs/yourkit.nix
new file mode 100644
index 0000000..d01d22a
--- /dev/null
+++ b/pkgs/yourkit.nix
@@ -0,0 +1,20 @@
+with import <nixpkgs> {};
+stdenv.mkDerivation rec {
+  name = "yjp-${version}";
+  version = "2015-build-15056";
+
+  src = fetchzip {
+    url = https://www.yourkit.com/download/yjp-2015-build-15056.zip;
+    sha256 = "0y3d3fs91w0qbdvbm4nr02rmkbqmndl7j4rhxwzibs815ci659jn";
+  };
+
+  buildInputs = [ unzip makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out
+    cp -ra ./ $out/yjp
+    chmod +x $out/yjp/bin/*/yjp_dc
+    makeWrapper $out/yjp/bin/yjp.sh $out/bin/yjp \
+      --prefix PATH : ${jdk}
+  '';
+}