Accounting / Inventory Management System

I have client who will have no problems using Linux (+ LTSP) if I can show
that there is several major choices for Accounting / Inventory Management
using Linux. I have found one @ http://www.compiere.org/ but I would like
to find at least three. Any help would be greatly appreciated.

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John Albee
Active Computing, Inc.
voice: (602)448-4528
fax: (800) 852-3735
john@aciaz.com