OpenERP is one of several powerful Open Source ERP systems. There is much to learn from these projects. The question is, in which way OpenPetra will be different and will justify the efforts to create and maintain a full framework for ERP basically?

How much extension work would need to be done for the several Open Source ERP systems out there, so that they provide what a charity needs?

Some links to start:
http://www.openerp.tv/: Tutorials and other screencasts for OpenERP
Medical: This is an Open Source Hospital Information system based on OpenERP; how much did they need to extend?
List of existing modules
Develop your own modules: Open Object Framework
Other Open Source ERP systems can be found on SourceForge: Interestingly enough, the Top 25 most active projects have quite a lot of them… Most active at Sourceforge

What do you think?
Would you investigate one of those solutions and report back how much they are suitable, and how much work would be required?