Funnily enough, I just happened to have ported D-Flat to macOS and Linux in the last couple of weeks. Check it out (w/screenshots): https://github.com/ghaerr/dflat. It uses a small TUI library that maps multi-byte ANSI/xterm arrow key and mouse wheel inputs into unicode private-use codes for internal processing by D-Flat. It also remaps all of the IBM PC code page 437 characters for unicode output, and converts the entire "PC-compatible" screen image including attributes into ANSI terminal output, thanks to some nice code from the Cosmopolitan Project.