Borland TurboVision (the PC text mode windowing UI used in Turbo Pascal/C++) has been open-sourced and updated to work seamlessly on Linux and with Unicode:

https://github.com/magiblot/tvision

It’s all in C++, though if someone hasn’t wrapped it in bindings for Python/Rust/&c. yet, surely they will

GitHub - magiblot/tvision: A modern port of Turbo Vision 2.0, the classical framework for text-based user interfaces. Now cross-platform and with Unicode support.

A modern port of Turbo Vision 2.0, the classical framework for text-based user interfaces. Now cross-platform and with Unicode support. - magiblot/tvision

GitHub
@acb I always loved this style of interface. So much so I made a similar thing for use on Arduino/microcontrollers that targeted ANSI terminals. Never got around to making it work with Unicode though, which was vaguely on my to-do list.