There must be something like global available "open-source" in software to education!

I am not sure, what exactly is expected here. But there is a lot of material available under Open Source for education - ranging from learning management systems, open content, programs to support learning, etc. Here are a few sites you will find handy to refer to:

• http://richtech.ca/seul/
• http://edu.kde.org/
• http://osef.org/
• http://Schoolforge.net
• http://www.ofset.org/freeduc/

I am sure there are more... Is there a good set of FOSS for education somewhere? - Sasi