Friends of Guava

• Error-Prone - break your build!
• Glazed Lists - observable collections
• GSON - read and write JSON
• Google Web Toolkit - we support it
• ICU4J - unless all your users live in the same place
• Joda-Time - if you can't use java.time, then you should use JodaTime!
• JUNG - a fully-featured graph library (if common.graph doesn't do what you want yet)
• MOE - this is how we keep our internal and external codebases in sync
• Mockito - Googlers' favorite mocking framework
• ProGuard - shrinker/bundler/obfuscator/optimizer

Other projects we work on

• Auto - generated value type classes, factories and more
• Caliper - we use it to benchmark our code
• Dagger - a high-performance dependency injector using code generation
• Guice - a mature dependency injector that uses reflection
• Jimfs - an on-heap java.nio.file file system (primarily for testing)
• Truth - a fluent testing framework designed to make your test assertions and failure messages more readable