LibreOffice
LibreOffice is the open-source, desktop alternative to Microsoft Office or Google Docs Editors. There are a wide set of tools in the LibreOffice suite, including Writer (word procesing), Calc (spreadhseets), and Impress (presentations).
Pros:
- File formats are open standards that are compatible with Microsoft and other office suites
Cons:
- Dated user interface
- Missing some advanced/familiar features from more popular office suites