When I began notating music for this site, I was using an old version of Sibelius. Now that there are mature, open-source, FREE cross-platform alternatives, I'm transitioning to those (Musescore 2 and Lilypond). I recommend anyone looking for typesetting software look into these two options, Lilypond if you have any coding experience, and Musescore if you prefer the WYSIWYG approach.
New arrangements are generally typeset in Lilypond, which is an amazing tool (albeit with a difficult early learning curve.) Musescore has a superior MusicXML importation so I'm gradually converting all the older arrangements to that format for maintenance. Anything marked "Alt Typeset" or "Alt Font" is now set in Musescore and was formerly Sibelius.
A small number of arrangements will be transitioned to Musescore not marked as alternate font but with a version indication. This means I made a revision of some sort and don't want the unrevised version to be available. So far I'll Face Myself from Persona 4 is the only case where this has happened (I revoiced two chords).
- RigorMortis999