Here is a chart describing some of the software tools available, their features, and cost.

Collaborative Writing Tools: Comparison Chart : Sheet1
















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Zoho Writer
Quick Doc Review
WriteBoard
GoogleDocs
NearTime
SocialText
EditGrid
Coventi Pages
Gobby
Groove
ACE
SynchroEdit
Please Review
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File types supported
Text, Images
Text
Text
Text, Spreadsheet, Images
Text, Images
Text, Images
Spreadsheet
Microsoft Word files
Text
Text, Spreadsheet, Images
Text
Text
Text, Images
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Software/Web-based
Web-Based
Web-Based
Web-Based
Web-Based
Web-Based
Web-Based
Web-Based
Web-Based
Win, Mac, Lin
Win
Win, Mac, Lin
Web-Based
Web-Based
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Max Editors
N/A
N/A
Unlimited
50
Unlimited
Unlimited
N/A
N/A
N/A
Unlimited
N/A
N/A
N/A
.
Public/Private
Public/Private
Public/Private
Private
Public/Private
Private
Private
Public/Private
Private
Private
Private
Private
Private
Private
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Text chat



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Revisions
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RSS


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Email updates
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Real Time - Co-editing



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Comments

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Spell check
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Export/File Formats
*/DOC, PDF, HTML
*/DOC, HTML, PDF

*/XLS
*/HTML, XML
*/HTML, Text
*/XLS, HTML, PDF, XML
*/Microsoft Word files

*/Office formats



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URL
http://writer.zoho.com
http://www.quicktopic.com/
http://www.writeboard.com/
http://docs.google.com/
http://near-time.com/
http://www.socialtext.com/
http://www.editgrid.com/
http://www.coventi.com/
http://gobby.0x539.de/
http://www.groove.net/images/buttons/btn-try-2.gif
http://ace.sourceforge.net/
http://www.synchroedit.com/
http://www.pleasereview.com/evaluation.html
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Price
Free
Free. Premium version at $79 per year
Free
Free
4.95/month
Free(5 users) or starting from $95/month(up to 20 users)
Free or $5/user/month for organizations
Free
Free
$229
Free
Free
$55/month

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