Twitter open sourced twemcache, its memcached fork (engineering.twitter.com)

They also announced twemproxy (a fast, light-weight proxy for memcached) which was quietly open sourced before: https://github.com/twitter/twemproxy

The Memcached maintainer's reaction to this sudden, large code drop of a fork and the way it was communicated to the community:

https://github.com/twitter/twemcache/issues/2