Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Squid Proxy - Website Content Acceleration and Distribution. Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients.
memcached - High-performance, distributed memory object caching system
Privoxy - Privoxy helps users to protect their privacy.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Artica Proxy - Artica Proxy is an appliance that claim to manage Squid-cache proxy with all features that Squid...