Free and Open Source Office Suites
The following Office Suites are similar to Microsoft Office and other commercial office software with one significant difference, these are free open-source products.
Free Open Source Software (FOSS) is quality software. You probably use FOSS, or access it several times a day and don't realize it. FOSS products power the Internet, web sites, phones and apps; even Apple and Microsoft make use of FOSS.
LibreOffice offers word processing, spreadsheet, presentation, database, vector graphics and math formula editor. LibreOffice files can be saved in several formats including those use by Microsoft Office. LibreOffice is based on OpenOffice, below. Either of which is an excellent suite.
Apache OpenOffice also offers word processing, spreadsheet, presentation, database, vector graphics and math formula editor. The differences between LibreOffice and OpenOffice are primarily cosmetic and history. It primarily boils down to personal preference.
Caligra adds a project management program to the suite, and also offers word processing, spreadsheet, presentation, database, vector graphics. Sometimes one feature makes the difference.
Scribus is a desktop publisher software. A couple comparatives are InDesign by Adobe and Publisher by Microsoft. " It is designed for layout, typesetting, and preparation of files for professional-quality image-setting equipment. Scribus can also create animated and interactive PDF presentations and forms. Example uses include writing newspapers, brochures, newsletters, posters, and books."{wikipedia}
Thunderbird One thing the office suites above do not offer is an email, calendar, contact management system. Thunderbird meets that need.
I think one reason more prople don't use free open source software is the idea "free" means low quality. With these, nothing could be further from the truth. Plus, if you do not like them simply uninstall them. You will have not lost anything.