There are 2 repositories under reference-counting topic.
GCC plugin that embeds CPython inside the compiler
Safe concurrency in D (`shared` made easier)
garbage collector algorithm 垃圾回收算法的系列实现
An object-oriented, extensible reference-counting utility for Fortran
A fast reference counting library for C++
A reference-counting, tracing garbage collector in completely safe Rust
Intrusive reference counting smart pointer, highly configurable reference counted base class and various adapters
Reference counted fortran data structures
A multithreaded concurrent GC with industrial-strength object-dissolving action
A Pascal stream class that is implemented as an interface, thus offering reference-counting.
An Arc (atomically reference counted smart pointer) that supports customized dropping strategies using Backdrop.
Tasty, useful general purpose C++ utility classes and functions. Many of these are used as building blocks in the Chops libraries.
Persistent tree structure written in Pascal that can handle binary data.
An implementation of an ANSI C class system similar to Apple's Core Foundation. (Retain/release, autorelease, mutable/immutable, etc)
C# library for managing shared ownership of Disposable reosources
Wrangle class names on HTML elements with reference counting.