Google Open Source - All of Googles open source projects under a single umbrella
Startup Stash - A curated directory of 400 resources & tools for startups
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Content Marketing Stack - A curated directory of content marketing resources
Open Source @IFTTT - A collection of IFTTT OSS projects.
StartupResources.io - Tightly curated lists of the best startup tools