Stirling PDF
#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere
Why it is included
Deploy our secure application, API, or AI Agent to process sensitive documents on your own infrastructure. Air-gapped & Open Source. Trusted by 55K companies and 75% of the Fortune 500.
Best for
Users exploring vetted FOSS alternatives in this space (document modifier).
Strengths
- ~76,165 GitHub stars (per upstream list)
- Open source
Limitations
- Verify license, platform support, and security posture for your environment.
Good alternatives
Related tools
Office & Productivity
DocuSeal
Open source DocuSign alternative. Create, fill, and sign digital documents ✍️
Office & Productivity
OCRmyPDF
OCRmyPDF adds an OCR text layer to scanned PDF files, allowing them to be searched
Office & Productivity
Documenso
The Open Source DocuSign Alternative.
Office & Productivity
OpenSign
🔥 The free & Open Source DocuSign alternative
Office & Productivity
Harper
Offline, privacy-first grammar checker. Fast, open-source, Rust-powered
Office & Productivity
LanguageTool
Style and Grammar Checker for 25+ Languages