We use our proprietary database format ("efdb"), developed by The Electronic Farm. It is not an open standard format like SQL or else.
The base Programming Language is TCL/TK.
TCL is in the 11 Top security level of different open source projects revised by Coverity which means that our developer language is one of the most secure ones, which is a good base to build a system. Find out more about TCL/TK here.
The TK part of TCL/TK is an object oriented type programming language. TCL itself is a script-based programming language similar to HTML.
There's also a SQL lite DB: fwdb.db3 => farmers wife data base.db3 containing Rate Cards, Histories and Invoices.