Super Mediocre Guitar
Don't just be mediocre, be super mediocre
Lots of good tools and visualizationshttp://fretflip.com/
Library of songs in Chordpro formathttp://getsome.org/guitar/olga/chordpro/
Lyrics libraryhttps://www.azlyrics.com
Guitar Chord Diagram Creatorhttps://chordpic.com/