3. Calligra Suite
Stepping a bit closer to Microsoft's new suite in terms of cross-platform compatibility is Calligra Suite, a graphics and office suite created by the KDE project from KOffice in 2010. With versions for desktop PCs, tablets, and smartphones, this package includes eight components spanning word processing, spreadsheets, presentations, databases, vector graphics, and more. It can be downloaded for free for Linux, FreeBSD, OS X, and Windows.
4. OxygenOffice Professional
OxygenOffice Professional, meanwhile, is an enhanced version of OpenOffice that comes with extra goodies including templates, clip art, samples, fonts, and Visual Basic for Applications (VBA) support. Now in version 3.2.1, this free software can be downloaded for 32-bit Windows as well as 32- and 64-bit Linux.
5. Feng Office Community Edition
Finally, there's Feng Office Community Edition, a free and open source online project management and collaboration tool formerly known as OpenGoo that offers task management, document management, project management, time tracking, knowledge management, and more. Users of the software can create and edit text documents and presentations online; they can also upload, organize, and share files. The free software can be downloaded online; paid professional versions are also available starting at $59 per month.