Open365 Alternatives

ONLYOFFICE is a complete office and productivity suite.

Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.

Open Source

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Would you need Office Word, Excel or PowerPoint for Home, business or School? WPS.com would give you right version for you.

Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online

Apache OpenOffice is an open source, office document productivity suite.

Open Source

SoftMaker Office is an office suite for Windows, Linux, Android, Windows Mobile, and Windows CE.

Zoho is an all-in-one online office suite.

CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.

Open Source freemium €5.0 / Monthly (Personal 5GB)

With Office Online you can view, edit, and share Word, Excel, PowerPoint, and OneNote files on your devices using a web browser, so you can work anywhere.

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

OfficeSuite offers office productivity tools like documents, spreadsheets, presentations and PDFs across all the devices.

iWork is an office suite by Apple.