Open365 is described as 'The open source cloud with LibreOffice online - LibreOffice online + Seafile + KDE. Improve your productivity and communicate better with your team members. The world is moving forward. Welcome to the open source cloud!' and is a Email Client in the Office & Productivity category. There are more than 25 alternatives to Open365 for a variety of platforms, including Windows, Online / Web-based, iPhone, iPad and Android. The best alternative is LibreOffice, which is both free and Open Source. Other great apps like Open365 are ONLYOFFICE (Freemium, Open Source), Microsoft Office Suite (Paid), Apache OpenOffice (Free, Open Source) and Microsoft Office Outlook (Paid).
LibreOffice is a free and open-source office suite that is compatible with other major office suites, and is available on all operating systems. It is an independently-developed version of the OpenOffice.org suite. The office suite includes: ...
OpenProject is an open-source project management software with a wide set of features and plugins. It supports project timelines / Gantt charts, issue tracking, wiki, document management, time and cost reporting, code management, Scrum and much more.
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability