LibreOffice

For most people, an office suite just needs to open, edit and save a document — something that shouldn't cost a yearly fee. LibreOffice offers the full six-app suite, stays compatible with Microsoft formats, works offline, and has no subscription or cloud lock-in.

It's the official choice of many governments and schools. If you only write the occasional document or spreadsheet, it's all you need — and it saves you a whole Office subscription.