tools

WebPagetest – Website Performance and Optimization Test

This is the one the WP Engine guys recommend.
Style Tiles
Regex Tester
Mobile Responsive Design Testing¬es=
GTmetrix | Website Speed and Performance Optimization
WordPress Serialized PHP Search Replace Tool | Interconnect IT – WordPress Consultants, Web Development and Web Design
iTextEditors – iPhone and iPad text/code editors and writing tools compared
UsabilityHub
TinEye Reverse Image Search
Private group chat and IM, business and team collaboration – HipChat