Spreadsheets

Abykus
Full-featured object-oriented spreadsheet for Windows. Freeware.
http://www.abykus.com/

eMiddleware
Provides spreadsheet technology to work with established systems. Company information and product description. In Germany and the UK.
http://www.emiddleware.com

European Spreadsheet Risks Interest Group
Promotes research regarding the extent and nature of the problem of spreadsheet risks.
http://www.eusprig.org

GNU Oleo
A GNU spreadsheet.
http://www.gnu.org/software/oleo/oleo.html

GS-Calc
Offers 512 columns and 2,097,152 rows, hierarchically organized worksheets, 2D and 3D charts, unlimited undo/redo, OLE client/server and COM functions. Description and screenshots of the program, online ordering.[Win9x/ME/2000/XP]
http://www.jps-development.com/gs-calc.htm

Mariner Calc
For the Mac, version 9 or X. Description of the product, presentation of the company.
http://www.marinersoftware.com

mySpreadsheet:
Offers a multi-user, web-based spreadsheet system. Online demo and presentation of the company.
http://www.myspreadsheet.com

Sharp Tools Software
Proposes a Java, Excel-compatible spreadsheet.
http://www.cs.columbia.edu/sharptools

The Spreadsheet Page
By John Walkenbach, author of the spreadsheet column for PC World magazine. Offers history, links, and illustrated jokes as well as files, FAQs, and release list for Excel, Lotus 1-2-3, and Quattro Pro.
http://www.j-walk.com/ss/

Spreadsheet Tools and Their Producers
List of spreadsheets tools and books and their authors.
http://www.emsps.com/lists/ssutilp.htm

Spreadsheets Frequently Asked Questions
FAQ of the comp.apps.spreadsheets usenet newsgroup.
http://www.faqs.org/faqs/spreadsheets/faq/

VisiCalc
One of the first "killer apps" for personal computers. Information from its creators, Dan Bricklin and Bob Frankston.
http://www.bricklin.com/visicalc.htm