Ruby Toolbox - Explore and compare open source Ruby libraries
Toole - Search for and discover online tools
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
Rage Grade by FullStory - Benchmark your customer frustration
LibHunt - LibHunt tracks mentions of software libraries on relevant social networks. Based on that data, you can find the most popular projects and their alternatives.
F*** You Pay Me (Beta) - Made by influencers, for influencers.