The 'Util' project

Engine Vectors: Array-like data structures for in-place data access

Primitives: Expanding upon java.util.PrimitiveIterator and java.util.function.* for {byte, char, float, short}

The 'Base' project

fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small ...

Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are ...