[RndTbl] Rapid prototyping of multi-user database for LAN/Server environment

I am looking for a software platform for prototyping a multi-user database, hosted in a LAN/Server network. The primary focus is on rapid prototyping of the databases, forms, screens, reports, etc.  over scalable and production grade software platform suite (ie. LAMP) A little looking around, and I found the similar LibreOffice BASE and HyperSQL (www.hsqldb.org). Any suggestions, recommendations? Thank you in advance for the help. Regards Brock