Ubuntu :: Looking For OpenOffice Alternative For Spreadsheets

So I'm trying to create a spreadsheet that operates in hexadecimal, binary (maybe), and decimal, for fairly large values. While openoffice does handle hexadecimal fine, if you convert it to decimal (at least so far, if anybody has a more naturalistic way of doing this, that would be great), it can't seemingly handle how large the values are, and truncates. So, if possible, I would like an open source alternative that is perhaps more robust than OpenOffice. Hopefully one exists.