Saola

Interesting online plain text editor. Allows storage of “files within files”. Executable and scriptable via JavaScript.

OSXNotes

Brilliant set of CLI commands and keyboard shortcuts etc for Mac OSX

Simple Image Processing Script, comes with Mac OS X and allows you to perform simple image operations from the command line.

List of useful stuff for Bash scripting (checking if files exist, etc etc)

Awesome list of ways to use SED to do cool stuff.