Requirements: Android OS
Price: $2.75
Overview: Chord! is the last chord charts book you will ever need, and it plays them too!
Chord! is a guitar chord finder. Unlike most of the other apps, it generates itself chords diagrams, so it supports any chord (even slash's ones like D/F#) in any tuning, with any number of strings (guitar, banjo, ukulele, bass, mandolin, etc.).
You can hear how each diagram sounds by sweeping your finger across the strings. The diagrams are displayed in color and you can view stats about the current fingering.
You can also reverse search chords: Entering on a neck the fingering will give you instantaneously the possible names of the chord and you will then be able to explore possible variations.

Furthermore, it embeds a database with a hundred of tunings for various instruments and you can add you own ones.
The app fully supports left handed instruments.