http://www.danga.com/mogilefs/ : MogileFS is our open source distributed filesystem.

http://www.danga.com/memcached/ : memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.

http://www.picpix.com/ : FotoBilder is an open source web application built on mod_perl & MySQL that lets users manage pictures.