xTuple PostBooks If your manufacturing, distribution, or e-commerce business has outgrown its small business roots and is looking for an ERP to grow with you, you may want to check out xTuple PostBooks. It's a comprehensive solution built around its core ERP, accounting, and CRM features that adds inventory, distribution, purchasing, and vendor reporting capabilities. xTuple is available under the Common Public Attribution License (CPAL), and the project welcomes developers to fork it to create other business software for inventory-based manufacturers. Its web app core is written in JavaScript, and its source code can be found on GitHub. To see if it's right for you, register for a free demo on xTuple's website.