ISPConfig for Linux

Open source hosting control panel

ISPConfig is an open source hosting control panel for Linux, licensed under BSD license. ISPConfig allows administrators to manage websites, e-mail addresses and DNS records through a web-based interface. The software has 4 login levels: administrator, reseller, client and email-user.

Diaspora*

The Community-run, Distributed Social-network

Diaspora* is a free personal web server that implements a distributed social networking service. It allows its users to host their data with a traditional web host, a cloud-based host, an ISP, or a friend. The framework, which is being built on Ruby on Rails, is free software and can be experimented with by external developers.

Seafile Cloud Storage

File Syncing and Collaboration for Teams

Seafile helps you with: File syncing and sharing – You can organize files into libraries. Each library can be shared between users and into groups. Team Collaboration – Edit and comment files online. Seafile offers messaging, group discussion, activity notification and file versions.

OwnCloud

OwnCloud is free and open source software that operates as a very simple way to set up your own syncing, Dropbox-like cloud storage system on your own server or web site. It's quick and easy to set up, and doesn't require advanced technical knowledge. OwnCloud allows people to make and share their own apps that run on ownCloud including text editors, task lists, and more.