LibreOffice - free independent office suite of open source, created as an offshoot of the development OpenOffice.org.Vklyuchaet a few applications that are comparable in features with similar applications from the package Microsoft Office: Writer - a word processor; Calc - a spreadsheet; Impress - the creation of and viewing of multimedia presentations; Draw - a vector graphics editor; Math - editor of mathematical formulas. One very positive qualities - the ability to work all these applications with the appropriate document format MS Office.