http://www.ofbiz.org/

From their site:
"The Open For Business Project is an open source enterprise automation
software project licensed under the MIT Open Source License. By open
source enterprise automation we mean: Open Source ERP, Open Source CRM,
Open Source eCommerce, Open Source SCM, Open Source MRP, Open Source
CMMS/EAM, and so on."

It looks quite interesting, but I also found this page:

http://ofbizwiki.go-integral.com/Wiki.jsp?page=FirebirdSQL

"We have seen reports of difficulties with Firebird SQL.
key size too big
If you search: Firebird SQL "key size too big" in Google you can find a
lot of information on this issue."

Does anybody know if FB 1.5 solves this issue?

Thanks for attention.
Marcello