Roman Numeral Analysis
MuseScore 3.3 now supports Roman numeral analysis, using a font called Campania that I developed. So MuseScore users can add Roman numeral analysis to their scores via Add > Text > Roman Numeral Analysis. But the Campania font also allows you to enter RNA in any program that supports OpenType features.
Here are links to download Campania in Open Type (OTF) and TrueType (TTF) formats:
I have tested it with MuseScore and LibreOffice, and I assume it will work in any commercial alternatives to these free and open source applications.
To use the font, just install it normally (e.g., on Windows, double-click the download file then click the "Install" button in the dialog that appears), then select it as you would any other font in your program of choice.
Campania is designed to be extremely easy to use - just type plain text and all the formatting happens automatically. See the examples above for more information.
Feel free to leave comments with any suggestions or problems you encounter using Campania!