8) SignMyPad

$3.99 in the iTunes and Android stores

Autriv Inc.

Why mess with paper even when you need a client signature? Open a PDF file on your iPad, and SignMyPad lets your client sign it. They can use a magnetic stylus or just their finger. You can then save and send it. If you really need a hard copy, it lets you print to any compatible AirPrint printer. Documents can be loaded from email, Dropbox, or Google Docs. For $14.99, the SignMyPad Pro version offers GPS-location stamping to provide extra evidence of signature authenticity.