An anonymous reader writes "One of my coworkers recently left the company, and I had to take over most of his responsibilities, including the maintenance and development of a homegrown CRM/ERP system. The system has evolved over more than a decade under the hands of at least four different developers and is based on Microsoft Access. Since I have been assigned this additional role, a day rarely passes without a user yelling for help because some part of the software is failing in strange and unpredictable ways, or some of the entered data has to be corrected manually in some obscure table in one of several database files. Without any exaggeration, some of the Visual Basic source code would be sufficient for several stories on The Daily WTF, and could make a grown man cry. Instead of spending further hours on optimizing this software i would rather like to start from scratch with some existing open-source CRM/ERP system that can be adapted to my companies needs. So far I have looked at and tested several CRM systems, including SugarCRM, vtiger, Feng Office (formerly known as opengoo), Zurmo and Fat Free CRM. Feng Office and Fat Free CRM look really nice and easy to use; the other ones could take a bit less bloat but are fine nevertheless. What software would you choose?"