OpenRCT2

Like many people who grew up in the 90s, I have very fond memories of playing RollerCoaster Tycoon growing up. OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2, the popular theme park simulation game from 2002. The project started off as a reverse-engineering effort, implementing the game from scratch in C, and later C++. As the implementation progressed, development expanded to new features, localisation, and improved quality of life enhancements requested by the -surprisingly large- community.

From 2016 to 2020, I was actively involved in the development of the game, starting off as a hobby project when I was on exchange at university in Japan. In the project, I initially focused on addressing perceived shortcomings in the game's interface and localisation. I later also mentored new contributors, which was often very rewarding.

Changing the scenario selection window to present scenarios grouped by source game (RCT1, RCT2, and their expansions)
When scrolling to zoom in viewports, follow the cursor position rather than the viewport centre
Added a full Japanese localisation of the game's UI and in-game objects
Accommodate Chinese, Japanese, and Korean languages

At the time of writing, I am still in the top 10 contributors out of several hundred people.