libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit, Julia, pyuv, and others. Its feature includes event loop backed by epoll, kqueue, IOCP, event ports.
Asynchronous TCP and UDP sockets,
Asynchronous DNS resolution, Thread pool, Signal handling and lot more.