guava-libraries - Project Hosting on Google Code
http://code.google.com/p/guava-libraries/

primitive io conurrent

core java libraries by google

google java utility library, good stuff for working with strings, etc...

"contains several of Google's core Java libraries"

Google、基礎ライブラリ

a bunch of core google libraries released together, similar to google collections, but dealing with more core stuff around java. like, uh, file copying and string utils, etc