"I have lots of positive things to say about Gnumeric.
As a stand-alone application, it is an excellent program. It's not
afraid of a lot of data, either. Each sheet holds 65,536 rows and
256 columns of data, which makes for 16,777,216 cells of data to
manage. I created some workbooks with all of these cells full of
data and there were no stability problems at all.
If you want to use Gnumeric for file sharing, Gnumeric also
offers a nice array of XML, HTML, text, and even Excel import and
export filters. Curiously, the Excel formats are listed as Excel 95
on the Import and Save functions, but Gnumeric was easily able read
Excel 2000 formatted workbooks. Gnumeric read my Excel files
flawlessly and without a noticeable dip in speed.
And that's something I kept coming back to in this application.
No matter what I threw at it, whether over-formatted Excel files or
huge workbooks full of data, Gnumeric never faltered or slowed.
It's stability and speed in GNOME was excellent. It even clipped
right along in KDE, too."