[itsme]

MuseScore is a good example how that could be.
An excerpt from the MuseScore manual:

Note spelling
By default, MuseScore uses letter names for chord symbols. For users in regions where other note
naming schemes are used, MuseScore provides the following controls:
- Standard: A, Bb, B, C, C#,...
- German: A, Bb, H, C, C#,...
- Full German: A, B, H, C, Cis,...
- Solfeggio: Do, Do#, Reb, Re,...
- French: Do, Do#, Réb, Ré,...
In addition, there are options to control capitalization. By default, MuseScore automatically capitalizes
all note names as shown above, whether you originally enter those using capital or lower case letters.
However, you can also choose other automatic capitalization options:
- Lower case minor chords: c, cm, cm7,...
- Lower case bass notes: C/e,...
- All caps note names: DO, RE, MI,...
You can also turn off the automatic capitalization completely, in which case note names are simply rendered the way you type them.