It is a long story but the original OpenOffice.org was bought by Oracle, many of the best developers left the project and formed LibreOffice from the open-source code because they did not agree with some of Oracle's standards. Then Oracle decided it was best to donate OpenOffice for a tax write off since most of the developers left and they could no longer keep the product going. So they donated OpenOffice to Apache.Any reason why Libre Office is better.
Well all office software has vulnerabilities but LibreOffice is really good at patching known vulnerabilities faster than most others.
Check out these links- http://articles.bplans.com/4-free-alternatives-to-microsoft-excel/Thanks, I really want an alternative of office as its because i only need of Excel for that i need to install a large software so i want a small size alternative of Excel which can save document of Excel document. Is there any other alternative.