A search for Pinyin fonts at the Open Font Library currently yields 15 font families.
Not all of those, however, really do support Hanyu Pinyin with tone marks. Here are the ones that work, though not always without problems:
I’ve previously mentioned more than one of these: Pecita and the various Gentium faces. I’ll write more about the latter in another post on the work coming out of SIL.
Full list (including fails), for future reference:
- Consola Mono
- Douar Outline
- Futhark Adapted
- News Cycle