Open Source Office & Productivity Apps

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.

A versatile open-source word processor with robust formatting, style options, and cross-platform availability, ideal for both memos and complex book publishing.

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.

An open-source Windows scripting language enabling task automation through hotkeys, macros, and keystrokes, useful for creating custom forms and automating data entry.

Multi-platform document viewer supporting PDF, EPUB, comics and images with annotation tools, sidebar navigation, signature verification, and text-to-speech.

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.

LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.org Calc, professional data miners and number crunchers will appreciate its comprehensive range of advanced functions.

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.

Multi-platform clipboard tool monitoring and saving text, images, and custom formats, with tabs, search, shortcuts, scripting, and customization for efficiency.

Comprehensive writing tool for notes, citations, and drafting with privacy-first features and multi-language support, perfect for diverse writing tasks.

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.

Manages clipboard history, supports text, images, and syncs across computers. Offers encryption, search, thumbnails, and full Unicode with multilingual support.

Apache OpenOffice is a leading open-source office suite that offers free applications for word processing, spreadsheet, presentations, graphics, databases and more. All data is stored in an open standard format, though Open Office can also read and write files from other common...

CryptPad is a private-by-design alternative to popular office tools and cloud services. All the content stored on CryptPad is encrypted before being sent, which means nobody can access your data unless you give them the keys.

Handwritten notes and PDF annotation app with pen input, shape drawing, customizable toolbar, image insertion, audio recording, and multi-platform support.

Open-source client enhancing Thunderbird with more features and bug fixes. Offers security patches and multi-row descriptions like Outlook.