LibreOffice, like OpenOffice before it, is a mixed bag.
Draw is a Visio-like structured drawing too.Impress, like PowerPoint, is a slide-based presentation tool.Calc is the spreadsheet alternative to Excel.You can get the Windows, Mac, or Linux version from the download page, and comes with a half-dozen key productivity apps: Politics aside, LibreOffice is a worthy alternative to Microsoft Office.
As it evolves, though, LibreOffice will continue to diverge from OpenOffice and - this is the most important thing for many people - it is not under Oracle's influence, which means it's going to remain free and available no matter how OpenOffice is affected by Oracle's business plans. It's based on the same source code as Oracle's OpenOffice, and right now it is substantially the same overall product. But let's get this out of the way right up front: LibreOffice is not something completely new. LibreOffice is a free, Open Source office suite that is thoroughly cross-platform: You can use it for Windows, Mac, and Linux.