There are 2 repositories under mpmc-queues topic.
A fast mpmc queue with broadcast capabilities
A bounded wait-free(almost) zero-copy MPMC queue written in C++11, which can also reside in SHM for IPC
Bounded multiple producers multiple consumers queue for .NET
lock-free data structures: SPSC ring buffer, MPMC ring buffer, MPMC single linked list queue, MPMC single linked list stack; lock free memory management library using fix sized memory managed in single linked list
Very Fast MPMC C++ implementation
Concurrent computing practice
Lock free Multi-Producer Multi-Consumer queue