The main system at the insurance company where I currently work is written in FORTE 4GL's TOOL (I think it stands for The Object Oriented Language) https://en.

The main system at the insurance company where I currently work is written in FORTE 4GL's TOOL (I think it stands for The Object Oriented Language) https://en.wikipedia.org/wiki/Forte_4GL https://en.wikipedia.org/wiki/Forte_4GL It's basically an earlier version of Java, so I don't think there's much to learn from it. To make things worse, the developers of the system in their infinite wisdom developed a custom scripting language that looks like an ill-conceived assembler. It's apparently cheaper to have some developers support this monster than to rewrite it from scratch or buy an off-the-shelf product (which, to be fair, are horrendously expensive and consultant fees are ridiculous). I learned the language through mentoring and reading the online documentation. You really get to value communities and stuff like StackOverflow or Github when you don't have them :)