Immutable persistent data collections for Javascript which increase efficiency and simplicity.
Immutable persistent collections for Kotlin
Immutable collections in C#
Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects.
Dart Package: Immutable lists, sets, maps, and multimaps, which are as fast as their native mutable counterparts. Extension methods and comparators for native Dart collections.
Assorted immutable collection datatypes for Rust
Efficient, Immutable, Thread-Safe Collection classes for Ruby
Immutable Dart collections via the builder pattern.
Persistent (immutable) collections for Java and Kotlin
Fast and memory-efficient immutable collections and helper data structures
Generic, Null-safe, Immutable Collections and Functional Transformations for the JVM
Immutable and structurally typed data
Redux Immutable facilities.
Collections Abstraction Library
Create immutable objects
Immutable state for React.js
GS Collections has been migrated to the Eclipse Foundation, re-branded as Eclipse Collections. https://www.eclipse.org/collections/