Putting the pieces together.
GitReview is a definitive portal comparing software libraries and providing links to useful tutorials, documentation and bug reports from all over the web. So far there are over 300,000 libraries referenced from NPM, Ruby Gems, Composer and Pypi with more to be added in future.
You can add your own packages and libraries, add links and comments and upvote whatever you deem useful. As a free community based resource, the more everbody is involved, the more everybody wins!
Of the 4 package indexes (Pypi, Composer, RubyGems & NPM) that have been scraped so far, over 330,000 packages are currently present on this site. These are the top packages from each of those indexes, as voted by users.