PitchWall - Browse new startups, and submit your mobile app/games startup's beta page here.
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.
Growing Page - Browse web projects and evaluate them by multiple criteria.
Ruby Toolbox - Explore and compare open source Ruby libraries
Product Hunt - A website that lets users share and discover new products
GitNews Web - Trending repositories from GitHub, HackerNews & Reddit