Document Management - Can "Knowledge Tree Live" move it to the cloud?

Well, document management is free to move to the cloud.

But to the users it sure isn't (for many of commercial solutions). Consider (from the OP):

"According to the company's price list on-premise version of Knowledge Tree has an annual fee of $2,400 for a 20-user license at the basic level. The most basic SaaS version is $2,950 for 10 users, and is limited to 50 GB of storage"

What about small-time users? How about a small-sized offering?

Better yet: some open source solutions?