Forks and patchsets

• http://code.google.com/p/memcachedb - A distributed key-value storage system designed for persistent, based on memcached, tugela and bdb.
• http://code.google.com/p/dbcached - memcached + qdbm/berkeley-db
• http://meta.wikimedia.org/wiki/Tugela_Cache - memcached + persistence
• http://repcached.lab.klab.org - memcached + replication
• http://code.google.com/p/memcached-pro

Reimplementations

• http://code.google.com/p/spcached/
• http://tokyocabinet.sourceforge.net/tyrantdoc/ - HTTP and memcached protocol networking frontend to tokyo cabinet
• Java versions
• http://www.thimbleware.com/projects/jmemcached
• http://code.google.com/p/jemcache/
• http://code.google.com/p/gmemcached - on Grizzly NIO framework
• http://www.jgroups.org/javagroupsnew/docs/memcached/memcached.html - jgroups version of memcached
• http://www.infoq.com/news/2008/10/jgroups-memcached
• http://code.google.com/p/actord - scala version of memcached
• http://code.google.com/p/cacherl - erlang version of memcached
• Queues based on memcached protocol
• http://memcachedb.org/memcacheq - queue based on memcached protocol
• http://code.google.com/p/memqd
• http://rubyforge.org/projects/starling - ruby based, from twitter
• http://robey.lag.net/2008/11/27/scarling-to-kestrel.html - scala based queue, from twitter
• http://code.google.com/p/sparrow - ruby based
• http://code.google.com/p/peafowl - python based
• http://xph.us/software/beanstalkd - incompatible protocol was inspired by memcached protocol
• http://labs.gree.jp/Top/OpenSource/Flared.html - yet another memcached
• http://overlayweaver.sourceforge.net - research on overlay networks, recently speaks memcached protocol

Memcached proxies

• http://github.com/northscale/moxi
• http://code.google.com/p/memagent

Other

• memcached session manager
• http://code.google.com/p/memcached-session-manager/
• http://memcachefs.sourceforge.net
• http://github.com/andrewfromgeni/mcinsight - GUI to examine memcached server
• Accessing memcached directly from Apache
• http://tangent.org/608/mod_memcached.html
• http://code.google.com/p/modmemcachecache/
• HTTP caching frontend to memcached
• http://tomayko.com/writings/rack-cache-announce = Rack::Cache