I released version 2.0 of the flux.net content management system and application framework yesterday. Go get it from http://www.fluxcms.co.uk/ if you haven't got it already!
FLUX.net is an open source content management platform and web application framework. It offers very advanced content and asset management facilities out of the box, coupled with an exceptional developers API and framework for building even the most complex web applications quickly and efficiently. Flux is presently in stable release 2.0 and 3.0 is in development.