Google Open Source - All of Googles open source projects under a single umbrella
SaaS 1000 - Free exportable list of the fastest growing SaaS companies
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Look at that SaaS - Inspiration and resources for SaaS founders
Code NASA - 253 NASA open source software projects
pickSaaS - Hundreds of SaaS products, analyzed.