CometDocs: Online Document Management System

CometDocs is an online document management system that allows the user to convert documents into other formats such as PDF to Word, Excel, PowerPoint, or vice-versa.  You also get the capability of storing and sharing documents on their site.

Just like most freemium sites, CometDocs offers a free account with several subscription options.  This chart illustrates the current subscription prices, and if I were to move off of my free account into a subscription, I would likely choose the lifetime payment of $129.95.  If you're going to use CometDocs more than 13 months, it's definitely worth the lifetime payment.

If you're wondering about the features you get with free versus subscription, this next chart will show you exactly what you get.  

The conversion actually looks pretty decent, especially if you need to convert a PDF into a Word document.
This service would be useful for teachers who want to edit a PDF document to fit the needs of their class.