Links to another site to play tunes. 

Makes it pretty easy to create tune books with tables of contents and indices and to add tab for a number of different instruments. Little control of the format of the sheet music

Most computer systems

EasyABC

Easy to use, and in the lower left it will offer you hints while you are editing.  Free and open source

iOS (and iPadOS)

The Craic.  You can carry large libraries with you without need for an internet connection. Easiest search of the web for tunes in abc format (search and it shows tunes currently in your library and then below tunes from around the web which you can look at, play and save to your library).  Now offers "collections" which can be setlist.  If you play from the music, it offers a very useful option.  If you tap on the display of the dots all the controls go away (at least in portrait mode) leaving more room for the music and your screen will not time out until you tap the dots again (or switch apps)

Not free, but very fairly priced.

Android