LibreOffice is only available for Windows.
You may still download it but the .exe file will only work on Windows.
All tools included in LibreOffice are easy to use. Their controls are well organized and easy to find.
You can launch any tool and start a new project or open an existing one from a central control panel. This way, you only need to have one shortcut on your desktop instead of one for each tool.
The Math module can be used to write complex mathematical expressions quickly and easily. This includes special characters, for which you don't need to search through menus or use complicated keyboard combinations.
Projects can be saved in LibreOffice's own formats, but it is also possible to save them in MS Office format, so other people can open them.
The package doesn't take too much disk space and it can be installed fairly quick. Also, you don't need to sacrifice too many resources to run its modules.