Chordtunes is an iPad app for creating chord sheets for guitar, ukulele, and mandolin. Entering chords is as easy as typing. Chordtunes supports three PDF formats, transposing, lyrics, and Dropbox. Chordtunes is a collaboration between Mandozine and EUMLab in Germany.
Chordsongs is a free Web app for desktop and laptop computers. It provides a simple interface for creating chord charts. Chords for six tunings are available: Soprano Uke (ADF#B), Tenor Uke (GCEA), Baritone Uke (DGBE), Guitar (EADGBE), Mandolin (GDAE), and Mandola (CGDA). You only need to create a chord chart once. Selecting a different tuning will convert your song to that tuning.