LibreOffice: A Free alternate to Microsoft Office

Pros
•    Good performance
•    Portable
•    Free to download
•    Integrates database tools
•    Multiple OS supports such as: Windows, Linux and Mac.
•    User friendly interface
•    Fully functional Office tools

Cons
•    Slow loading
•    Few usability problems
•    Rough interface
•    Complete support for Microsoft format
•    Lengthy installation