diff --git a/pkgs/tb-dev-scripts/default.nix b/pkgs/tb-dev-scripts/default.nix
index 0d5ebdf..b0eeb3b 100644
--- a/pkgs/tb-dev-scripts/default.nix
+++ b/pkgs/tb-dev-scripts/default.nix
@@ -20,5 +20,11 @@ pkgs.symlinkJoin {
         "--prefix PATH : ${lib.makeBinPath [ pkgs.ffmpeg ]}"
       ];
     } (builtins.readFile ./video_loop_extractor.py))
+
+    (pkgs.writeShellApplication {
+      name = ",optipng";
+      runtimeInputs = [ pkgs.optipng ];
+      text = builtins.readFile ./optipng;
+    })
   ];
 }
diff --git a/pkgs/tb-dev-scripts/optipng b/pkgs/tb-dev-scripts/optipng
new file mode 100755
index 0000000..321e79b
--- /dev/null
+++ b/pkgs/tb-dev-scripts/optipng
@@ -0,0 +1,13 @@
+#!/bin/sh -x
+
+PROCS=$(grep -c ^processor /proc/cpuinfo)
+
+if [ -z "$@" ]; then
+    (for f in *.png; do
+         echo "$f";
+     done) | xargs -P$PROCS -d'\n' -n1 optipng -o7
+else
+    (for f in "$@"; do
+         echo "$f";
+     done) | xargs -P$PROCS -d'\n' -n1 optipng -o7
+fi
diff --git a/pkgs/tb-scripts/default.nix b/pkgs/tb-scripts/default.nix
index d13b71e..a6efd3c 100644
--- a/pkgs/tb-scripts/default.nix
+++ b/pkgs/tb-scripts/default.nix
@@ -15,5 +15,10 @@ pkgs.symlinkJoin {
     (pkgs.writers.writePython3Bin ",rename_lower" {
       libraries = [ ];
     } (builtins.readFile ./rename_lower.py))
+    (pkgs.writeShellApplication {
+      name = ",zipdir";
+      runtimeInputs = [ pkgs.zip ];
+      text = builtins.readFile ./zipdir;
+    })
   ];
 }
diff --git a/pkgs/tb-scripts/zipdir b/pkgs/tb-scripts/zipdir
new file mode 100755
index 0000000..cc2c134
--- /dev/null
+++ b/pkgs/tb-scripts/zipdir
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+zip -9rX "../$(basename "$PWD").zip" .