CoovaChilli is a feature rich software access controller that provides a captive portal / walled-garden environment and uses RADIUS or a HTTP protocol for access provisioning and accounting.

XtreemFS replicates your file data across multiple storage servers. Our replication algorithm is designed to automatically cope with all the problems and failure scenarios that can occur in truly distributed systems: message loss, network partitions, server crashes etc.

Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals.

HyperDex is a relatively new distributed key-value store designed from the ground up to provide a convenient user interface without sacrificing reliability or robustness. The result is a NoSQL storage system that provides a unique set of features not found together in other NoSQL or RDBMS systems.

Quantcast File System (QFS) is a high-performance, fault-tolerant, distributed file system developed to support MapReduce processing, or other applications reading and writing large files sequentially.

Mistserver is a lightweight, open-source multistandard multimedia server. It bridges the gap between lightweight webservers and the usually heavyweight mediaservers that support non-HTTP protocols.

Atom Hopper is an open source ATOMPub server for accessing, processing and aggregating ATOM entries. Atom Hopper was designed to make it easy to build both generalized and specialized persistence mechanisms for ATOM XML data, based on the ATOM Syndication Format and the ATOM Publishing Protocol.

RetroShare is a Open Source cross-platform, Friend-2-Friend and secure decentralised communication platform.
It lets you to securely chat and share files with your friends and family, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication.
RetroShare provides filesharing, chat, messages, forums and channels

xCAT offers complete management for HPC clusters, RenderFarms, Grids, WebFarms, Online Gaming Infrastructure, Clouds, Datacenters, and whatever tomorrow's buzzwords may be. It is agile, extensible, and based on years of system administration best practices and experience.

FlameRobin is a database administration tool for Firebird RDBMS.