GitPrep is Github clone. you can install portable github system into unix/linux. You can create users and repositories without limitation.

A personal cloud you can hack, host and delete

Python based delicious.com replacement

A free, hosted, portable and open source photo sharing service. A photo application that lets you store your photos on Dropbox, Amazon S3 or in your garage.

GitLab is a web-based Git repository manager with wiki and issue tracking features. GitLab offers hosted accounts similar to GitHub, but also allows its software to be used on third party servers.

Self-hosted code-review software

ProjectPier is a Free, Open-Source, PHP application for managing tasks, projects and teams through an intuitive web interface. It must be downloaded and installed on your own web server. ProjectPier will help your organization communicate, collaborate and get things done Its function is similar to commercial groupware/project management products, but allows the freedom and scalability of self-hosting.

Piwik is the leading open source web analytics platform that gives you valuable insights on your website's visitors, your marketing campaigns and much more, so you can optimize your online strategy and experience of your users.