Top Alternatives to Open365

LibreOffice ie previously known as OpenOffice which is an open source office suite including text editor, spreadsheet and presentation tools.

Apache OpenOffice is a free office package with a text editor, spreadsheet and presentation software.

Microsoft Office Suite is a software suite consisting of many office utilities.

Microsoft Outlook is a personal information manager from Microsoft.

WPS Office is an office suite for Microsoft Windows, Linux, iOS and Android OS.

Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.

ONLYOFFICE Document Server is an online office suite comprising viewers and editors for texts, spreadsheets and presentations.

ZOHO Corporation offers online business, network, and IT infrastructure management applications, and software maintenance and support services.

Claws Mail is a free and open-source, GTK+-based email and news client. It offers easy configuration and an abundance of features.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, etc.

OpenProject is a web-based project management system for location-independent team collaboration.

KMail is the email component of Kontact, the integrated personal information manager from KDE.

ThinkFree Office is an office suite written in Java that runs on Windows, Linux, Mac and Android platforms.

Polaris Office is a free office service that runs on Android, iOS, Windows and macOS.

MobiSystems OfficeSuite is the premier mobile office app and the trusted leader for reliably editing any type of office document and attachment.