I look at this and cannot help to compare the need for so many types of screwdrivers with the need for so many javascript libraries[0] or xml parsers[1] or anything not invented here, like a csv parser [2]

[0] http://en.wikipedia.org/wiki/List_of_JavaScript_libraries [1] http://en.wikipedia.org/wiki/Category:XML_parsers [2] http://tburette.github.io/blog/2014/05/25/so-you-want-to-wri...

C: https://notabug.org/koz.ross/awesome-c

Java: http://www.fromdev.com/2014/10/most-widely-used-java-librari...

Erlang: https://github.com/drobakowski/awesome-erlang

Elixer: https://github.com/h4cc/awesome-elixir

Python: https://github.com/vinta/awesome-python

Heck here is a list of the lists: https://github.com/sindresorhus/awesome#programming-language...