Google Open Source - All of Googles open source projects under a single umbrella
Insider Company Comparisons - Compare hundreds of top tech companies all in one place
Opensource Builders - Find open-source alternatives to commercial apps
Product Comparisons - Compare any 2 software products
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Startup Stash - A curated directory of 400 resources & tools for startups