http://www.techradar.com/news/the-best-free-office-software

Everyone needs reliable office software, and some of the very best suites are completely free – whatever operating system you use.

New Windows 10 PCs come with a trial of Microsoft Office installed, but this will soon expire, leaving you in need of a replacement. Macs come with Apple's own office suite, but if most of your colleagues are PC users, you might be better off trying a cross-platform toolkit instead.