Design Process
An online directory of other companies’ design principles
“Design Principles are a tool for creating a better, more consistent experience for your users. They are high level principles that guide the detailed design decisions you make as you're working on a project.” Lucky for us, a lot of companies post theirs. Even luckier, the folks at Design Principles FTW are collecting them. 
Website: The Most Comprehensive Collection of Design Principles on the Internet