Annotation processor to create immutable objects and builders. Feels like Guava's immutable collections but for regular value objects.
A high-performance immutable mapping type for Python.
Immutable persistent data collections for Javascript which increase efficiency and simplicity.
Create the next immutable state by mutating the current one
Persistent/Immutable/Functional data structures for Python
Assorted immutable collection datatypes for Rust
Immutable value types, enum classes, and serialization.
Immutable persistent collections for Kotlin