Collections
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The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.
Last Release on Aug 11, 2026
This library makes some new Scala APIs (mainly collections) available to older versions of Scala.
Last Release on Oct 7, 2025
fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast access and insertion; it provides also big (64-bit) arrays, sets and lists, sorting algorithms, fast, ...
Last Release on Jul 23, 2026
Standalone efficient collections.
Last Release on Mar 11, 2026
feature-rich collections framework for Java, offering alternatives to standard Java Collections.
Last Release on Jun 23, 2025
The API module of Eclipse Collections, offering rich and efficient data structures for Java.
Last Release on Jun 23, 2025
Kotlin Immutable Collections multiplatform library
Last Release on Jul 3, 2026
High Performance Primitive Collections: data structures (maps, sets, lists, stacks, queues) generated for combinations of object and primitive types to conserve JVM memory and speed up execution.
Last Release on Jul 10, 2026
Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.
Last Release on Aug 7, 2026
scala-parallel-collections
Last Release on Jan 7, 2025