Top Alternatives to Open365

LibreOffice is a powerful, free, and open-source office suite for text editing, spreadsheets, presentations, and more. It's compatible with a wide range of file formats, including Microsoft Office documents, making it a versatile alternative for personal and professional use across various operating systems.

Apache OpenOffice is a comprehensive and free office suite providing essential tools for document creation, spreadsheet analysis, captivating presentations, and more. It offers cross-platform compatibility and support for various file formats.

Microsoft Office Suite is a comprehensive collection of productivity tools designed for individuals and businesses. It includes essential applications like Word, Excel, PowerPoint, and Outlook, providing robust capabilities for document creation, data analysis, presentations, and email management. Seamless integration and cloud connectivity enhance collaboration and accessibility.

Microsoft Outlook is a comprehensive personal information manager designed for managing email, contacts, calendars, and tasks.

WPS Office is a comprehensive office suite providing writing, presentation, and spreadsheet tools. It boasts high compatibility with Microsoft Office formats and a user-friendly tabbed interface, making it a viable alternative for various platforms including Windows, Linux, iOS, and Android.

Apple Mail is the default email client for macOS, iOS, and watchOS, offering a seamless and integrated email experience across Apple devices with features like rich text editing, multiple account support, and robust organization tools.

ONLYOFFICE is a powerful and secure office suite offering online document, spreadsheet, and presentation editors. It fosters collaboration with real-time co-editing and integrates seamlessly with various cloud storage services, providing a robust platform for both individual and team productivity.

Zoho is a comprehensive suite of online business applications offering solutions for CRM, office productivity, collaboration, IT management, and more. It provides a unified platform to streamline various business operations.

Claws Mail is a powerful yet lightweight, open-source email and news client built on GTK+. It's known for its speed, stability, rich feature set, and high degree of customization, making it an excellent choice for users demanding control and efficiency.

EssentialPIM is a versatile personal information manager designed to help you organize your life. It allows you to manage appointments, tasks, notes, contacts, passwords, and more, all within a single, customizable application available for desktop and mobile platforms.

OpenProject is a powerful, web-based open-source project management software designed for teams of all sizes. It offers comprehensive tools for managing projects, tasks, teams, and communication in one centralized platform. Ideal for organizations prioritizing collaboration, flexibility, and data control.

KMail is a powerful and flexible email client tightly integrated with the Kontact personal information manager suite. Part of the KDE ecosystem, it offers robust features for managing your email, including strong encryption options, support for multiple protocols like IMAP, POP3, and Exchange, and seamless integration with other Kontact components like the calendar and address book.

ThinkFree Office is a comprehensive office suite written in Java, providing a robust and cross-platform solution for document creation, editing, and collaboration on Windows, Linux, macOS, and Android.

Polaris Office is a comprehensive office suite for cross-platform productivity. It offers a range of tools including word processing, spreadsheets, presentations, and PDF handling, all integrated for seamless workflow across different devices.

MobiSystems OfficeSuite is a comprehensive cross-platform office productivity suite offering powerful tools for creating, editing, and managing documents, spreadsheets, presentations, and PDFs. Designed for both mobile and desktop users, it provides a seamless experience for professional and personal use.