Resources

Native client

C++ client versions

https://archive.openrs2.org/pub/mirrors/runewiki.org/archive/oldschool.runescape.com/native/

216 Mac version with debug symbols (this means that the decompiled code will contain correct function names etc...)

https://rune-server.org/threads/the-great-nxt-beta-dump-thread.622541/

Tools

A software reverse engineering

https://ghidra-sre.org/

Dynamic instrumentation to hook into an executable

https://frida.re/

Cheat engine to find addresses

https://www.cheatengine.org/