bluuewhale/hash-smith

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

The Capsule Hash Trie Collections Library

High Performance Primitive Collections for Java

A Primitive Collection library that reduces memory usage and improves performance

Zero-allocation hashing for Java

Zero-dependency Java sorted Set and Map library featuring binary and N-ary tree families, JMH benchmarks, and hardware-counter-backed performance analysis.

Fast and memory efficient c++ flat hash table/map/set

Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.