I make plugin's and extra commands for a sandbox game called Classicube as of right now i only know how to code in C#, but i am learning Python and will learn other languages in the future.
ClassiCube is a free to play online multiplayer sandbox game like Classic.
There are multiple servers, these are 4 main servers (New Blood Zombie Survival, Puissant Royal, Not Awesome 2, and Jacob_'s CTF.).
You also have the option to make/run your own server thats where mine and many other people's plugins/commands come in. Server owners can freely use these public commands and plugins on there server to make it a better server then it already is!.
Other users that make plugins/commands for ClassiCube.
Venk, Goodly, and UnknownShadows200.