xTuple - OpenMFG, PostBooks ERP and Accounting Software.xTuple the leader in open source, enterprise resource planning software is pleased to announce the, general availability of XTN.xTuple, the leader in open source enterprise resource planning software.xTuple is an Enterprise Software company, author of two ERP solutions Postbooks and OpenMFG.xTuple Network Aims to Ease Open-Source ERP Concerns.Open Source ERP: xTuple Applications for Windows, Linux, and Mac OS X. PostBooks is free; OpenMFG is commercial-source licensed. xTuple - OpenMFG, PostBooks ERP and Accounting Software.