List of Top Repositories by Programming Language

One of the main reasons I like Perl is CPAN (Comprehensive Perl Archive Network) is the ease of finding, installing, and testing of packages it provides that solve a problem I was already trying to solve. I would like to know of any similar repositories for PHP, Python, Ruby, Java, C++, Javascript, etc..., or better, a comprehensive list of such repositories. What are the top repositories you go to for the languages you program in, or what repositories do you use to share your code?

The list from the comments so far is:

• C++: Boost
• Haskell: HackageDB
• Java: Maven and SpringSource
• JavaScript: Scripteka and JSAN
• Lua: LuaForge and LuaRocks
• OCaml: GODI
• PHP: Pear and Pecl
• Perl: CPAN
• Python: PyPi
• R: CRAN
• Ruby: RubyGems
• TeX, LaTex: CTAN