TortoiseSVN for Windows

If you'd like to use Subversion on Windows, you might want to use the TortoiseSVN client. It lets you use commands and see the status of files from within Windows Explorer.
Operating System: Windows

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Dolphin

Open Source Social Networking Platform

Dolphin - Smart Community Builder. It is the universal web community script written in PHP and MySQL. Dolphin has a lot of features: Innovative Builders for site customization, Groups, Classifieds and Events , Tags, Rss feeds, Flash Promo and much more.

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.

SparkleShare - Cloud Storage

SparkleShare is open-source client software that provides cloud storage and file synchronization services. By default, it uses Git as a storage backend. It is comparable to Dropbox, but the cloud storage can be provided by the user's own server. The advantage of self-hosting is that the user retains absolute control over their own data.

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