JamBook is a free application that can store any song that you have the chords for! Just create a song, then begin adding however many chords you would like to it. If you would like, you can also upload a picture to a song. Click on a chord to find information such as chord charts and scales that you can play over the chord, and simply tap on the screen to cycle through the chords in your song.
JamBook also features a groups features where you can share songs with your band. Just create a group, and begin creating songs that will be shared to every member of your band. The group feature also includes a map where you can place your local gigs so your whole band can stay on the same page.