
I've been using Adempiere since, I believe, 2006. Adempiere has been customised to fit a variety of businesses, but here are a few examples. Built a textiles extension and modified and implemented for one of the largest education cum staffing businesses in South India, as well as customized and implemented as a financial module for one of India's top health insurance companies. Review collected by and hosted on G2.com.
I like mainly three parts of it, i.e., architecture, extensibility, and maintenance. On top of that, it has every feature possible, from RFQ to HR modules to finance and reporting tools. Review collected by and hosted on G2.com.