Ajax and other rich interface technologies have opened up the door for online document sharing tools that provide the ability to offer software as a service. Everyone appreciates the html wysiwig editor when its available for modifying normally boring text entry fields. Think about now embedding all the functionality of microsoft word, excel or even powerpoint in your browser. This gives the ability to access documents from anywhere in the globe, true online collaboration without having to share your desktop, and unlimited storage in the cloud. This is what the world wide web was initially made to do, make it easier to share documents online.
A few contenders stand out in this space. Here are the Wikipedia definitions for these products:
The Zoho Office Suite is a Web- based online office suite containing word processing, spreadsheets, presentations, databases, note-taking, wikis, CRM, project management, invoicing and other applications developed by ZOHO Corporation(formally AdventNet Inc.), an Indian-based company. It was launched in 2005 with a web-based word processor. Additional products, such as spreadsheets and presentations were incorporated later into Zoho. Zoho applications are free to use at the entry-level but require a fee for more extensive or professional use. » Read more: Software as a service