Gnumeric

Gnumeric The Gnumeric spreadsheet which is part of the GNOME desktop environment and is intended to be a drop in replacement for commercial spreadsheets and it offers a customizable feel that attempts to minimize the costs and pain of transition. Gnumeric will import your existing Excel, 1-2-3, Applix, Sylk, XBase and Oleo files. You should be able to start the program by typing "gnumeric". There is also good documentation online by clicking on the help menu.