Top pick
Full office suite with strong ODF support and broad import/export filters.
officeodfoffline
Office & Productivity
Offline-first suites and self-hosted collaboration for teams that need real document fidelity and data sovereignty. Fast viewers such as Sumatra PDF sit alongside full editors when you only need to read.
Tools in this category (15)
Office suite emphasizing Microsoft Office compatibility and ribbon UX.
officeooxmlbusiness
Also strong
LibreOffice technology in the browser for collaborative editing with self-host and integration options.
officecollaborationself-hostedodf
Also strong
Real-time collaborative text editor you can self-host with plugins and exports.
collaborationrealtimeself-hosted
Honorable mention
Apache-maintained office suite (writer, calc, impress, base, draw) using the OpenDocument Format.
officeodfspreadsheetdocuments
Honorable mention
Minimal Windows PDF, eBook, and comic viewer focused on speed and a small install size.
pdfviewerwindows
Also strong
#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere
definitive-opensource
Honorable mention
Open source DocuSign alternative. Create, fill, and sign digital documents ✍️
definitive-opensource
Honorable mention
OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched
definitive-opensourcecli
Honorable mention
The Open Source DocuSign Alternative.
definitive-opensource
Honorable mention
🔥 The free & Open Source DocuSign alternative
definitive-opensource
Honorable mention
Offline, privacy-first grammar checker. Fast, open-source, Rust-powered
definitive-opensource
Honorable mention
Style and Grammar Checker for 25+ Languages
definitive-opensource
Honorable mention
The world's smartest system-wide grammar assistant; a better version of the Apple Intelligence Writing Tools. Works on Windows, Linux, & macOS, with the free Gemini API, local LLMs, & more.
definitive-opensource
Honorable mention
Grist is the evolution of spreadsheets.
definitive-opensource