OverAPI lists a bunch of handy tools and it’s home to a compilation of cheat sheets for a bevy of languages.
The ones that matter to WordPress theme and plugin authors:
- PHP
- CSS
- JavaScript
- jQuery
- MySQL
- SVN (WordPress’s primary version control system)
- Git
- RegEx
- mod_rewrite
If you find that a cheat sheet is out of date or missing information, you can contribute to the project over at GitHub.
