Free Pascal comes with Free Vision. FV has some weird history in that Borland released their C++ conversion of Turbo Vision to public domain, then someone converted that to Turbo Pascal and converted it to use graphics instead of textmode (with coordinates in pixels, etc) and then it was ported to Free Pascal and converted back to text mode and to use Free Pascal's cross platform text mode units. The Free Pascal IDE that comes with the compiler is made using Free Vision and Free Vision works on pretty much any platform Free Pascal itself supports (as long as it has some form of text mode).
Regardless of the history, the API is basically the same, you can even read a tutorial written for Turbo Vision and apply it to Free Pascal with minimal changes.
Recently there has been a UTF-8 version (original TP -and FV- was made for 8bit DOS character codes) though it is a big buggy and slower than the non-UTF-8 version. I tried to use to make an Info viewer[0] some months ago but i had to switch to the non-UTF-8 version due to the bugs.
Regardless of the history, the API is basically the same, you can even read a tutorial written for Turbo Vision and apply it to Free Pascal with minimal changes.
Recently there has been a UTF-8 version (original TP -and FV- was made for 8bit DOS character codes) though it is a big buggy and slower than the non-UTF-8 version. I tried to use to make an Info viewer[0] some months ago but i had to switch to the non-UTF-8 version due to the bugs.
[0] https://i.imgur.com/Qvkt3W0.png