A port of an old VB6 SMBX engine, purely written in C++. It reproduces an old engine completely (except an Editor).
It is a full C++ port of the original SMBX engine which now works on multiple platforms (tested on Linux, Windows and macOS), and it does accurately represent original gameplay with the rest of features (and bugs)!
Homepage - https://wohlsoft.ru/forum/viewtopic.php?f=5&t=3677
A forum post with explanation and download links. The full-featured official homepage is planned and it's WIP.
*Source code repository* - https://github.com/Wohlstand/TheXTech