SongBook is described as 'Manages your song collections with lyrics and chords' and is an app. There are six alternatives to SongBook for a variety of platforms, including Windows, Android, Windows Phone, Kindle Fire and Linux apps. The best SongBook alternative is OpenSong, which is both free and Open Source. Other great apps like SongBook are OpenSongApp, SONGb, SongbookPro and Fretlist.
OpenSong is a free, open-source software application created to manage lyrics, chords, lead sheets, overheads, computer projection, and more.
Use your Android device as a mobile songbook and presenter software for displaying chords and lyrics using the OpenSong song format.
SONGb: Minimalist songbook app with chord detection, easy chord repositioning, optimized c++ code. Fast, small and free.
SongbookPro replaces all the hassle of carrying and organizing your chord charts, lyric sheets and songbooks with a simple app on your laptop or tablet.
Fretlist is a web app built for musicians who perform live. It gives you one place to store your chord sheets (lyrics + chords), transpose to any key, and build setlists for gigs and rehearsals.
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Songbook displays chord-diagrams and OpenSong does not. OpenSong is primarilly focussed on singing.