fheroes2

About
Heroes of Might and Magic II is the turn-based strategy game this project recreates; the original game and its assets were made by the former The 3DO Company, with rights later transferred to Ubisoft. fheroes2 is an open-source, from-scratch recreation of the Heroes of Might and Magic II game engine, aiming to reproduce the original game while adding improvements such as high-resolution graphics support, an improved AI, and various logic and user-interface fixes. It's actively developed, cross-platform (Windows, macOS, Linux, Android, PSVita, Switch and others), and licensed under GPLv2.
How it differs from the original
Compared to the original, fheroes2 adds high-resolution graphics support, an improved AI, and numerous gameplay and interface fixes, documented in the project's own list of improvements. It does not include the original game's copyrighted assets; players are expected to own the original game or use a free demo version instead.
Getting started
The project provides an installation guide covering how to obtain and set up the required game data, including using a free demo version if you don't own the original. Players are encouraged to purchase the original on GOG or the Ubisoft Store to use its assets legitimately.
History
Development originally started on SourceForge before moving to its current GitHub repository.