This is an interest topic as we see more and more crypto currency with smart contracts and embedded custom languages. Even bitcoin contained a script language that is custom implemented as part of the blockchain protocol.
REVELA DECOMPILER
Decompile Aptos smart contract to recover Move source code
https://revela.verichains.io/
Here is the source code:
https://github.com/verichains/revela
There’s also a JEB plug in called diem that should decompile Move bytecode:
https://github.com/pnfsoftware/jeb-plugin-diem