Ateji PX, now available for the Java language, by reducing development & debugging time, Ateji PX let you concentrate your talent on good design & performance tuning. You can find linear programming, portfolio optimization software & java threads with Ate
Varnish is a state-of-the-art, high-performance HTTP accelerator. It uses the advanced features in Linux 2.6, FreeBSD 6/7 and Solaris 10 to achieve its high performance.
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.