My previous employer Rapsyx decided lately to publish the light version of it’s prime product RapidOne as free software.
RapidOne in short words:
RapidOne Team provides a single application to handle communication, workplanning and resource sharing across the organization with a highly innovative storage concept organizing your data naturally
With the ability to add a whole set of CRM components depending on the version you choose.
Interesting? have a look at the free version here