I can not find TTF version of popular LaTeX font family: Latin Modern Roman. I have found only OTF version. Is there any restrictions about TTF implementation or I am bad in searching?
Not a direct answer, but a workaround:
If you already have the otf font you can use e.g. FontForge to convert the files. OTF is just an extended version of TTF, the method how glyphs are specified is the same, so the characters will stay the same.