More from the Gnome people:
GnumericThe Gnumeric spreadsheet is part of the GNOME desktop environment: a project to create a free, user friendly desktop environment.
The goal of Gnumeric is to be the best possible spreadsheet. We are not attempting to clone existing applications. However, Gnumeric can read files saved with other spreadsheets and we offer a customizable feel that attempts to minimize the costs of transition.
Gnumeric is...
Free!
Gnumeric and its source code are available free of charge, licensed under the terms of the GNU General Public License. This makes it easy to audit, and make custom extensions.
Fast!
Gnumeric handles large spreadsheets while remaining responsive.
Accurate!
A spreadsheet should calculate the right answer. Gnumeric's built-in functions and tools are accurate. A recent report praised Gnumeric as more accurate than leading proprietary spreadsheets.
They are not kidding about fast, it starts instantly (running the windows build on vista here). A quick evaluation shows array worksheet functions (e.g. LINEST) working as expected. (like excel) Chart tool seems OK, but darned if I can figure out how to add a trendline to an x-y plot, if it is possible. I suppose I could calculate it from the linest results and add another series to the chart but that would be a pain...
Overall it looks good. Hmm... lemme test it on a big SFC shiplist....
edit: it worked a little to open the OP+4 shiplist (short delay), but it opened it as a TAB/CSV delimited text file just fine, a data autofilter on the second row and a view freeze panes on the third row works just fine (as in excel) though responsiveness does slow down contrary to their claim. Still though, it appears to do the job just fine, and for free!