Links to the tools that Ted Curran shared: Stylebot, Shoestrap. Bootswatch, Foundation, HexColor, Color Cop.
Julian Medina explains some of his adventures moving sites back and forth between MAMP and production servers.
Slides from Stefan Didak’s Real Developer Tools for WordPress presentation at the June 2013 East Bay WordPress Meetup
Sallie Goetsch demonstrates a few basic tools for web design–WordPress or otherwise.
PhpStorm is a great tool for developing anything with PHP. If more WordPress developers used PhpStorm, we’d have a much better overall quality of WordPress plugins!