* https://github.com/cantino/huginn - Huginn - Allows you to build agents that monitor and act on your behalf. Built in Ruby - MIT
## Blogging platforms
* [Chyrp](http://chyrp.net/) - An extra-awesome, extra-lightweight blog engine ([Source code](https://github.com/chyrp/chyrp))
* [Dotclear](http://dotclear.org/) - Take control over your blog!
* [Wordpress](https://wordpress.org/) - Create a beautiful website or blog.
* [Blogotext](http://lehollandaisvolant.net/blogotext/en/) - a free blog-engine written in PHP and using SQLite. This offers you both an unmatched simplicity during installation and great performances. ([Source code](https://github.com/timovn/blogotext)
* [Ghost](http://ghost.org/) - Just a blogging platform
* [blosxom](http://blosxom.sourceforge.net/) - a lightweight yet feature-packed weblog application designed from the ground up with simplicity, usability, and interoperability in mind.
* [Anchor CMS](http://anchorcms.com/) - Anchor is a free, lightweight, faster-than-a-bullet, simple blogging system, made for art–directed posts. ([Source code](https://github.com/anchorcms/anchor-cms))
* [Bumpy Booby](http://bumpy-booby.derivoile.fr/) - A simple, responsive and highly customizable PHP bug tracking system. ([Source code](https://github.com/piero-la-lune/Bumpy-Booby))
* [Phproject](http://www.phproject.org/) - A high performance full-featured project management system ([Source code](https://github.com/Alanaktion/phproject), [Demo](http://demo.phproject.org/))
* [Flyspray](http://www.flyspray.org/) - uncomplicated, web-based bug tracking system ([Source code](https://github.com/Flyspray/flyspray))
* [Tinyissue](https://github.com/mikelbring/tinyissue) - Simple Issue Tracking for Teams
* [Kanboard](http://kanboard.net/) - A simple and open source visual task board
* [Taiga.io](https://taiga.io/) - Your Agile, Free and Open Source Project Management Tool ([Source code](https://github.com/taigaio))
* [Gaskit](https://github.com/bkeepers/gaskit) - a git-backed issue tracker. It uses a branch in your local git database to store the tickets.
* [Redmine](http://www.redmine.org/) - Redmine is a flexible project management web application
* [Apache Bloodhound](https://bloodhound.apache.org/) - Manage software products, Keep track of features, tasks and bugs
* [ChiliProject](https://www.chiliproject.org/) - a web based project management system.
## Communication Systems
* https://github.com/IgorAntun/node-chat - Node-Chat - A not-so-basic open-source chat with admin features. - MIT
## Download tools
* [Alltube](https://github.com/Rudloff/alltube) - A web interface for [youtube-dl](https://github.com/rg3/youtube-dl), a program to download videos and audio from [more than 100 websites](https://rg3.github.io/youtube-dl/supportedsites.html) ([Demo](http://alltubedownload.net/))
## File Sharing
* https://coquelicot.potager.org/ - Coquelicot - Coquelicot is a “one-click” file sharing web application with a focus on protecting users’ privacy. - GNU-AGPL 3.0
* http://friendica.com/ - Friendica - Social Communication Server. GNU-AGPL 3.0
* [BuddyPress](http://buddypress.org/about/) - A powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more.
## URL Shorteners
* https://github.com/YOURLS/YOURLS - YOURLS - YOURLS is a set of PHP scripts that will allow you to run Your Own URL Shortener. - MIT