Hi @Wijnand
Great to hear your interest and about the CO Foundation!
Kolibri will be made available for Debian/Ubuntu and also for Windows. But we need time to develop it before we can support it in real deployments. So it exists, just please don’t deploy it before the end of the year when the public release is made available 
If you want to host KA videos for Math, then KA Lite can satisfy this requirement easily – but planning for Kolibri at a later stage is a great idea because of the additional contents, improved user interface, coach reports etc.
Please also refer to our public site and sign up for the newsletter for announcements! http://learningequality.org/
Smiles,
Ben