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I have written a portable Fasttracker II clone in C using SDL 2. Here's a screenshot.
What is Fasttracker II? Read about it on Wikipedia.

This clone is meant for computers with a modern GPU and CPU (from about 2008 or later recommended).
It's also designed for 60Hz monitor refresh rates, so it can act choppy if you're below/above 60Hz.

Note: If you used v1.04 up to v1.09, you should update to v1.10 (or later)!
A bug where you'd get no sound when entering notes in the song data was fixed.

FT2 clone v1.14 download: (changelog)

Windows 64-bit (recommended)
Windows 32-bit (has false virus positives!)
macOS/OS X 64-bit (OS X 10.7 and later - read Mac notices below!)
Linux packages for amd64/x86_64 (not supported by me, I'm also not sure which file you need)

Source code can be found over at GitHub. Please read "HOW-TO-COMPILE.txt". Compiles on Linux.

Note for v1.04 and newer: For less mouse cursor lag, make sure "Software mouse" is disabled in "Config -> Layout"

macOS/OS X important notices:

To be able to actually run the program, you need to right click the .app/program and click "Open".
This is only needed once, you can open it like normal after this.
A lot of important keybindings in FT2 are occupied and has to be rerouted or removed in the OS
To toggle fullscreen mode, press ALT+Enter or Ctrl+Cmd+F
The performance can be somewhat sluggish, especially on older retina MacBooks/Macs.
The mouse cursor can be heavily delayed, and turning off VSync (Config->Miscellaneous) can either help or make it much worse. Getting good performance and little delay with my tracker clones on (older?) Macs is heavily luck based!

Windows important notice:

If ALT+F4/ALT+F5 (copy/paste block) doesn't work and you have an NVIDIA GPU, you need to make sure
those keybindings are disabled in 'GeForce Experience' (if it's installed).

IRC: #protracker (yes, also goes for the FT2 clone) @ IRCNet (server: open.ircnet.net)