"ReactOS® is a free, modern operating system based on the design of Windows® XP/2003. Written completely from scratch, it aims to follow the Windows-NT® architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture."

Sweetcron is a self-hosted lifestreaming application that supports themes & plugins. It is based on the CodeIgniter php framework, from EllisLab.

"In the corporate world, Facebook, Apple and Google have launched platform services that allow external developers and companies to build services using their code - but the BBC is uniquely placed to use those same principles to create a cultural and commercial resource for the nation."

An open source image editor - looks good for when you don't need all the bells and whistles of Photoshop or the GIMP (which in my case means all the time).

Open source del.icio.us clone in PHP. Looks good.

Lots of suspicious delays in releasing anything, so possibly vapourware. If not, could be good...

The Open Source Introduction to Microeconomics

Free, Open-Source software for OS X

Nice plain forum app.