diff --git a/dotfiles/config/systemd/user/gitter.service b/dotfiles/config/systemd/user/gitter.service
index 5779ba95..e193e1b2 100644
--- a/dotfiles/config/systemd/user/gitter.service
+++ b/dotfiles/config/systemd/user/gitter.service
@@ -4,7 +4,7 @@ Wants=taffybar.service
 After=taffybar.service
 
 [Service]
-ExecStart=/usr/bin/env run_unity.sh gitter
+ExecStart=/usr/bin/env Gitter
 Restart=always
 
 [Install]
diff --git a/dotfiles/emacs.d/README.org b/dotfiles/emacs.d/README.org
index bc56184d..5fcc54c3 100644
--- a/dotfiles/emacs.d/README.org
+++ b/dotfiles/emacs.d/README.org
@@ -64,6 +64,7 @@ think its pretty awesome!
  [[Copy/Yank String Functions][Copy String Functions]]
 + [[namedbuild][Named Build of Builder Macros]] ([[https://github.com/IvanMalison/emit#named-builder][README]]) and [[composemacros][A Compose Supporting Macros]]
   ([[https://github.com/IvanMalison/emit#compose][README]])
++ [[Add a blacklist to a major mode]]
 ** Configuration of My Own Packages
 - [[term-projectile][term-projectile]] and [[term-manager][term-manager]]
 - [[org-projectile][org-projectile]]
@@ -933,6 +934,26 @@ This was stolen from https://github.com/jwiegley/dot-emacs
 (imalison:disable-mode-hook nlinum-mode)
 (imalison:disable-mode-hook yas-minor-mode)
 #+END_SRC
+** Add a blacklist to a major mode
+Sometimes a major mode's syntax highlighting can take a really long time to load
+in certain buffers. Usually you can just set a header to tell emacs not to run
+the major mode, but for cases where you can't always edit the file ahead of time
+this macro allows you to define a blacklist for your major mode that will
+prevent the major mode from being enabled on that file.
+#+begin_src emacs-lisp
+(defmacro imalison:add-blacklist-to-major (major-mode-fn-symbol)
+  (let ((blacklist-var-symbol (imalison:concat-symbols major-mode-fn-symbol "-blacklist"))
+        (check-blacklist-symbol (imalison:concat-symbols major-mode-fn-symbol "-check-blacklist")))
+    `(progn
+       (defvar ,blacklist-var-symbol nil)
+       (defun ,check-blacklist-symbol (mode-fn &rest args)
+         (unless (and (not (equal major-mode (quote ,major-mode-fn-symbol)))
+                      (equal nil args)
+                      (cl-loop for blacklist-regex in ,blacklist-var-symbol
+                               thereis (string-match blacklist-regex (buffer-name))))
+           (apply mode-fn args)))
+       (advice-add (quote ,major-mode-fn-symbol) :around (quote ,check-blacklist-symbol)))))
+#+end_src
 ** Other
 The stuff in this section is pretty crusty. I don't think its used anywhere, but
 I keep it around just in case I need it.
@@ -1423,6 +1444,7 @@ Paradox is a package.el extension. I have no use for it now that I use straight.
   :demand t
   :config
   (progn
+  (setq server-use-tcp nil)
     (defvar imalison:default-server-file
       (imalison:join-paths user-emacs-directory "server" "server"))
     (defun imalison:main-emacs-server-name ()
@@ -1441,7 +1463,6 @@ The file server file for this emacs instance no longer exists.")
     (defun imalison:get-this-server-filepath ()
       (let ((server-dir (if server-use-tcp server-auth-dir server-socket-dir)))
         (expand-file-name server-name server-dir)))
-    (setq server-use-tcp t)
     (when (equal nil (server-running-p)) (server-start)
           (imalison:make-main-emacs-server))))
 #+END_SRC
@@ -2561,6 +2582,10 @@ eval-last-sexp.
 *** nix
 #+BEGIN_SRC emacs-lisp
 (use-package nix-mode
+  :preface
+  (progn
+    (imalison:add-blacklist-to-major nix-mode)
+    (setq nix-mode-blacklist '("all-packages.nix")))
   :config
   (progn
     (setq nix-indent-function 'nix-indent-line)))
diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index b2d7c219..5db97889 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -1,5 +1,6 @@
 { config, pkgs, ... }:
 let
+  gitter = with pkgs; callPackage ./gitter.nix { };
   my-python-packages = python-packages: with python-packages; [
     appdirs
     requests
@@ -134,8 +135,11 @@ in
     emacs
     firefox
     kleopatra
+    gitter
     google-chrome
+
     hexchat
+    quassel
     keybase-gui-fixed
     kodi
     lxappearance
@@ -195,10 +199,18 @@ in
     sbt
     scala
 
+    # Node
+    nodePackages.npm
+    nodejs
+
+    # Rust
+    cargo
+
     # Tools
     bazaar
     binutils
     dfeet
+    dpkg
     gcc
     gdb
     gitAndTools.git-sync
@@ -214,6 +226,7 @@ in
     ncdu
     neofetch
     pass
+    patchelf
     plasma-workspace
     powertop
     python-with-my-packages
@@ -238,9 +251,10 @@ in
     transmission-gtk
   ];
 
-  environment.variables = {
-    GDK_PIXBUF_MODULE_FILE = "${pkgs.librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache";
-  };
+  # XXX: Plasma seems to set this
+  # environment.variables = {
+  #   GDK_PIXBUF_MODULE_FILE = "${pkgs.librsvg.out}/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache";
+  # };
 
   programs.gnupg.agent = { enable = true; enableSSHSupport = true; };
   # Enabling zsh will clobber path because of the way it sets up /etc/zshenv
@@ -270,7 +284,7 @@ in
     enable = true;
     layout = "us";
     desktopManager = {
-      gnome3.enable = true;
+      plasma5.enable = true;
       default = "none";
     };
     windowManager = {
@@ -305,8 +319,7 @@ in
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.extraUsers = let
     extraGroups = [
-      "wheel" "disk" "audio" "video"
-      "networkmanager" "systemd-journal"
+      "wheel" "disk" "audio" "video" "networkmanager" "systemd-journal"
     ];
     userDefaults = {
       inherit extraGroups;
diff --git a/nixos/gitter.nix b/nixos/gitter.nix
new file mode 100644
index 00000000..ba8547f1
--- /dev/null
+++ b/nixos/gitter.nix
@@ -0,0 +1,71 @@
+{ stdenv, alsaLib, atk, cairo, cups, dbus, dpkg, expat, fetchurl
+, fontconfig, freetype, gdk_pixbuf, glib, gnome3, gtk3, libX11
+, libXScrnSaver, libXcomposite, libXcursor, libXdamage, libXext, libXfixes
+, libXi, libXrandr, libXrender, libXtst, libappindicator-gtk3, libcxx
+, libnotify, libpulseaudio, libxcb, makeDesktopItem, makeWrapper, nspr, nss
+, nwjs, pango, systemd }:
+
+let gitterDirectorySuffix = "opt/gitter";
+    doELFPatch = target: ''
+      patchelf --set-interpreter ${stdenv.cc.bintools.dynamicLinker} \
+         --set-rpath "$out/${gitterDirectorySuffix}/lib:${libPath}" \
+         $out/${gitterDirectorySuffix}/${target}
+       '';
+   libPath = stdenv.lib.makeLibraryPath [
+     alsaLib atk cairo cups dbus expat fontconfig freetype gdk_pixbuf glib
+     gnome3.gconf gtk3 libX11 libXScrnSaver libXcomposite libXcursor libXdamage
+     libXext libXfixes libXi libXrandr libXrender libXtst libappindicator-gtk3
+     libcxx libnotify libpulseaudio libxcb nspr nss pango stdenv.cc.cc systemd
+  ];
+in stdenv.mkDerivation rec {
+  pname = "gitter";
+  version = "4.1.0";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "https://update.gitter.im/linux64/${pname}_${version}_amd64.deb";
+    sha256 = "1gny9i2pywvczzrs93k8krqn6hwm6c2zg8yr3xmjqs3p88817wbi";
+  };
+
+  nativeBuildInputs = [ makeWrapper dpkg ];
+
+  unpackPhase = "dpkg -x $src .";
+
+  installPhase = ''
+    mkdir -p $out/{bin,opt/gitter,share/pixmaps}
+    mv ./opt/Gitter/linux64/* $out/opt/gitter
+
+    ${doELFPatch "Gitter"}
+    ${doELFPatch "nacl_helper"}
+    ${doELFPatch "minidump_stackwalk"}
+    ${doELFPatch "nwjc"}
+    ${doELFPatch "chromedriver"}
+    ${doELFPatch "payload"}
+
+    patchelf --set-rpath "$out/${gitterDirectorySuffix}/lib:${libPath}" \
+         $out/${gitterDirectorySuffix}/lib/libnw.so
+
+    wrapProgram $out/${gitterDirectorySuffix}/Gitter --prefix LD_LIBRARY_PATH : ${libPath}
+
+    ln -s $out/${gitterDirectorySuffix}/Gitter $out/bin/
+    ln -s $out/${gitterDirectorySuffix}/logo.png $out/share/pixmaps/gitter.png
+    ln -s "${desktopItem}/share/applications" $out/share/
+  '';
+
+  desktopItem = makeDesktopItem {
+    name = pname;
+    exec = "Gitter";
+    icon = pname;
+    desktopName = "Gitter";
+    genericName = meta.description;
+    categories = "Network;InstantMessaging;";
+  };
+
+  meta = with stdenv.lib; {
+    description = "Where developers come to talk";
+    downloadPage = "https://gitter.im/apps";
+    license = licenses.mit;
+    maintainers = [ maintainers.imalison ];
+    platforms = [ "x86_64-linux" ];
+  };
+}