Depends, I suppose, on the depth of complexity you need from an Excell replacement, but for me Spread 32 works well. Originally written for 9x, I think it runs on 2K/XP but not sure.
It opens with a small nag screen...but there is no time limit and it is offered as a free app.
It is incredably small....292k
see:
http://www.xtort.net/office/spreadsheet.php
Bottom of page.
Also check out Floppy office at the same site for other small office apps that collectively fit on a floppy:
http://www.xtort.net/office/floppyoffice.php
I've not tried any of these, other than Spread32 that is included in that download
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Gravity is a contributing factor
in nearly 73 percent of all accidents
involving falling objects......DB.......................