spreadsheets

Google Solve feature can solve full-blooded linear programming problems right in your spreadsheet. This is much more sophisticated than the Excel Solve feature which can only change one cell to optimize the output variable.

Quoted: Google Spreadsheets have their roots in the technology of 2Web Technologies, who developed an application called XL2Web. In June of last year, an

Quoted: Warning - this article may be dangerously confusing to non-programmers

Open-Source Gnome Office Program - Gnummeric Spreadsheets software

Quoted: A web-based online spreadsheet with real-time collaboration features

Google Docs is now offline (via Gears) -- nice!

You can now get historical quotes on Google Spreadsheets.

More on Google spreadsheet. Very positive review....

Quoted: You can open XLS or CSV spreadsheets inside the tool and perform calculations, data sorting, run formulas — everything that you would expect from a solid spreadsheet app. There is also a marked emphasis on multi-user editing. Two or more users can view and edit a document at the same time. Users can be invited to view or edit a document, and Google Chat has been integrated into the application so that multiple users can offer input during the work session.

Looks interesting. They add collaboration to Excel rather than completely trying to replace Excel.

Quoted: eXpresso is the best way to share Excel spreadsheets with the people you know. eXpresso enables multiple contacts to work on the same Excel spreadsheet at the same time, saving all changes to a common version in real-time. Plus, you can track changes to specific cells, receive alerts when changes are made, and access version history or audit logs.