Sync.in

Sync.in is a web application that lets you create text documents directly from your browser and invite others to edit the same document in real time.

Its easy to use. Actually, the free version of this editor does not require registration. To get started, simply create a new document directly.

Once you've created your document, you can edit it in a traditional word processor program.

The innovation is in Share Button (Share), which lets you invite others to edit the document.

Once you finish editing, you can export it in different formats and it can be downloaded for use anywhere else.

Another interesting option in Sync.in is one that you can see the history of documented versions in sequence, and thus how it is documented based on input from all editors.