Forum OpenACS Q&A: Response to Books explaining ERP, CRM systems and related technologies?

Christopher B. Browne has a large collection of annotated links, among
them, "VIII. Business Oriented Computing", which includes stuff on
accounting software, RDBMS, SAP R/3, etc.:

http://www.ntlug.org/~cbbrowne/compbusiness.html

Something in there might be of use to you.