Haystack Search - Haystack helps you make the most of your time, by searching all your files and documents in the cloud in one place. It's been built for privacy from the ground up, so your data isn't stored on a server, just your computer.
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
MailJack+ - Send PDFs as postal mail
ProntoForms - ProntoForms is a mobile business solutions application, converting paper forms onto any tablet or mobile device.
Paperkit - Create and download custom graph, lined, or dot grid paper
Nintex - Cloud-based digital workflow management automation platform