Open Source Office & Productivity Apps for Android

Free and open-source office suite with advanced word processing, spreadsheets, presentations, vector graphics, math formula editor, and database tools.

Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc.

On-premises file sync, universal access, integrated collaboration, real-time communication with privacy and data control focus.

Open source note-taking app with Markdown support, to-do integration, and synchronization with cloud services like Dropbox and OneDrive.

Open-source suite for editing documents, spreadsheets, presentations, forms, and PDF files with co-editing modes, plugin support, AI assistant, and integration across 40+ platforms.

Free multi-platform software for task management, time tracking, and personal project management. Seamless integration with Jira, GitHub, and GitLab.

Local-first, privacy-focused notebook supporting Markdown and Org mode, offline use, encrypted backup, extensible with plugins, and more.

End-to-end encrypted app for email, calendar, and contacts, requiring no personal data, with open source code and quantum-resistant security.

Fully open-source, end-to-end encrypted notes with device-based security, secure sync, offline access, powerful editor, vault, backups, and exports.

Open-source app tracking time on devices, maintaining privacy and versatility, with features like productivity insights, Pomodoro timers, and local data storage.

Personal AI assistant operating locally, supporting popular chat apps, additional channels, multi-OS speech and listening, and a live user-managed Canvas.

Open-source workspace with full data ownership, offline access, multi-platform support, and deep customization through themes, plugins, and templates.

K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.

Cross-platform cloud note-taking with plain text, syncing, tagging, real-time collaboration, markdown, version history, and open-source clients.

Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.

The OSS Document Scanner is a free and Open Source app to transform your mobile device into a powerful document scanner.

Tasks is libre open-source software, based on the original source code from the popular Astrid Tasks & To Do List! Tasks is easy-to-use, feature-packed, flexible and customizable, and synchronizes with a variety of services.

Introducing Fossify Contacts - the next evolution in contact management. Poised to redefine how you manage your contacts, our app combines simplicity with advanced features, tailored for both personal and professional use.

Your personal note-taking haven for privacy and efficiency.

Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their long term goals. Detailed graphs help you to better track the progress of your habits.

Organize events with encrypted privacy, zero-knowledge and no tracking. Features include multi-device sync, multiple views, and offline support.

Highly versatile PDF and XPS solution offering customizable rendering and viewing with features like digital signatures, redactions, and annotations.

Offers end-to-end encrypted video calls, no tracking, guest links, privacy features like background blur, easy scheduling with calendar integration, and supports up to 50 free participants.

Gamifies habits, dailies, and to-dos with customizable avatars, team quests, rewards, and collectibles while tracking progress visually on web and mobile.

SiYuan is a desktop Markdown Block-Reference and Bidirectional-Link note-taking application. Support fine-grained block-level reference and Markdown WYSIWYG.