Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. Guava has only one code dependency - javax.annotation, per the JSR-305 spec.
JSR305 Annotations for Findbugs
Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format.
A library jar that provides APIs for Applications written for the Google Android Platform.
Annotation the FindBugs tool supports
Provider-configuration files for ServiceLoader.