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JSter - JSter is a community-driven catalog of the most useful javascript libraries.
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.
Best Open Source - Find best open source products across all platforms.
HatchBox - Super easy Rails servers. Configure any server to run Ruby on Rails servers in minutes and without hassle.
alternative zu - [GUI is only german, application descriptions mostly in in German, sometimes in English.]
Slant.co - Slant is a collaboratively edited resource that helps you quickly make decisions.