Somebody elsewhere has mentioned WyattERP for the AS/400. And sourcecode is available for at least two other ERP suites on the AS/400. (Whether they would be considered 'free' is another matter.) More interestingly it looks like the new owners of JBA, will be removing access to the source from it's customers. The article in http://www.opensource400.org/wyatterp/index.html includes a letter by Harry Debes--the president of Geac Enterprise Solutions.
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Somebody elsewhere has mentioned WyattERP for the AS/400. And sourcecode is available for at least two other ERP suites on the AS/400. (Whether they would be considered 'free' is another matter.) More interestingly it looks like the new owners of JBA, will be removing access to the source from it's customers. The article in http://www.opensource400.org/wyatterp/index.html includes a letter by Harry Debes--the president of Geac Enterprise Solutions.