Lobste.rs
Lobste.rs is an awesome Hacker News alternative. It is a Rails codebase and uses a SQL (MySQL in production) backend for the database and Sphinx for the search engine.
Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
Free and open source software (F/OSS, FOSS) or free/libre/open source software (FLOSS) is software that is both free software and open source. It is liberally licensed to grant users the right to use, copy, study, change, and improve its design through the availability of its source code.
Wagn
Wagn is an open web platform for building coherent web systems.Using simple wiki-inspired building blocks called cards, “Wagneers” construct sites ranging from simple content managers to custom project trackers to fully integrated web suites.
Refinery CMS
Refinery CMS is a modular and extendable CMS, Refinery allows you to get a fully content managed website up and running in just minutes. Install it, add in your design and extend it with any custom functionality you might need.
rstat.us
rstat.us is a simple and open standards microblogging platform.Simplicity is a core 'feature' of rstat.us. Interface of rstat.us is clean, and easy to understand. It give you just enough features to be interesting, but not enough to be complicated and confusing.
SprintApp
SprintApp is a powerful and full featured project and time tracking. it is simple to use so you can focus on running your business and focus on what you do best.
Hackety Hack
The Hackety Hack project is a learning management system with the ability to work through lessons, ask questions, upload programs, and everything else you see on Hackety.com. Hackety Hack will teach you the absolute basics of programming from the ground up. No previous progr...
Obtvse
A clean and simple markdown blog application, inspired by Svbtle.
Redmine
Redmine is a flexible and full featured project management application, it is also one of the most popular Rails open source projects, Redmine is still a great ticketing and project management application. It’s simple to use, administer, and deploy and contains many powerful f...
Locomotive CMS
Locomotive is a simple but powerful CMS based on liquid templates and mongodb database. At my company (NoCoffee), we use it for our clients when they request a simple website.
Selfstarter
Host your own crowdfunding site for your project. Integrates with Amazon Payments. Similar to Kickstarter, except for 1 project.
Gitlab
Gitlab is a self hosted Git management software
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