Check out ERPNext (http://erpnext.com/ http://erpnext.com/). It is a modern open-source ERP solution built in Python, has commercial support and an active commu

Check out ERPNext (http://erpnext.com/ http://erpnext.com/). It is a modern open-source ERP solution built in Python, has commercial support and an active community. There is also Eto (https://github.com/picoe/Eto https://github.com/picoe/Eto), a cross-platform C# GUI toolkit on which the excellent Manager accounting software (http://www.manager.io/ http://www.manager.io/) is built.