[jdcaron]

It might be overkill but I'm managing my small business with ERPNext (from that list). I'm surprised by the quality of the software and its user interface design. It seems I'm the only one using it around my peers so I'm probably ahead of the curve.

ERPNext is built on top of the Frappe framework which is also an other interesting piece of software. How many times you kickstart a project and need to manage user access roles and database schemas on top of what mostly matter; the data schema and the link between it's tables.