Top 6 Open-Source Alternatives to Open365

Product categories

Calendar Email Email Clients Enterprise Communication Office & Productivity Office Suites Productivity Project Management Software Development Task Management Work Management

Summary

The top open-source alternatives to Open365 are LibreOffice, Apache OpenOffice, and CryptPad. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

LibreOffice Landing Page
1

LibreOffice

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.
Pricing:
- Open Source
#Office Suites #Office & Productivity #Project Management 15 social mentions
Apache OpenOffice Landing Page
2

Apache OpenOffice

Apache OpenOffice is an open source, office document productivity suite.
Pricing:
- Open Source
#Office Suites #Office & Productivity #Project Management 13 social mentions
CryptPad Landing Page
3

CryptPad

CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.
Pricing:
- Open Source
- Freemium
- Free Trial
- €5.0 / Monthly (Personal 5GB)
#Office Suites #Project Management #Office & Productivity 88 social mentions
Spark Mail Landing Page
4

Spark Mail

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Pricing:
- Open Source
#Email #Email Clients #Calendar 30 social mentions
OpenProject Landing Page
5

OpenProject

OpenProject is an open-source project management software with a wide set of features and plugins.
Pricing:
- Open Source
#Project Management #Task Management #Productivity 4 social mentions
Mailspring Landing Page
6

Mailspring

Mailspring is a mail client for Mac, Windows and Linux.
Pricing:
- Open Source
#Email #Email Clients #Calendar 25 social mentions