Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.
GetAccept - GetAccept is a Sales tool for electronic signatures and sales document automation.
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.
Signaturely - Super simple eSignature software
Genius Scan - On The Go.
SignEasy for Gmail - Sign documents or collect signatures directly within Gmail