Async, Sync, Blocking, None-Blocking, Threads
---------------------------------------------

`gevent <http://sdiehl.github.io/gevent-tutorial/>`_

`greenlet <http://greenlet.readthedocs.org/en/latest/>`_

`eventlet <http://eventlet.net/>`_

`libevent <http://libevent.org/>`_

`epoll <http://en.wikipedia.org/wiki/Epoll>`_

`kqueue <http://en.wikipedia.org/wiki/Kqueue>`_