RollerCoaster Tycoon is described as 'Design and manage your amusement park, from constructing thrilling roller coasters to maintaining cleanliness and entertaining guests with diverse attractions' and is a simulation games in the games category. There are six games similar to RollerCoaster Tycoon for a variety of platforms, including Windows, Mac, Steam, Linux and Xbox apps. The best RollerCoaster Tycoon alternative is OpenRCT2, which is both free and Open Source. Other RollerCoaster Tycoon like games are Zoo Tycoon, Planet Coaster, Jurassic World Evolution and Parkitect.
FOSS, good mod support, active development, new features, bug fixes, changing currency in the game is implemented properly (in the original game, it just changes the currency symbol), native widescreen support, play RCT 1 and RCT 2 scenarios in the same game (if you have both installed), easy updates through launcher. As of typing, the 1.0 still hasn't been released yet. But it's well beyond playable, and many people prefer it over the original games.