Tibia is a retro MMORPG which has been running since 1997.
It’s free to play with optional premium services. Players can create avatars, level them up, find gear, form alliances and explore a persistent 2D online world.
You can find more information here.
I have been working on the project from 2018 to 2020. My responsibility was the maintenance and further development of the game servers and internal tools, like a custom map editor.
This was done mostly in C++ and Python.