DocuSign
Electronic signatures and agreement workflows
Open-Source Projects
Discover top open-source software, updated regularly with real-world adoption signals.
Discover top open-source software, updated regularly with real-world adoption signals.
Free, secure, self-hosted e-signature platform for any document
OpenSign provides a free, self‑hosted e‑signing solution with secure PDF signing, multi‑signer workflows, OTP guest verification, template management, audit trails and API integrations, rivaling commercial services.
OpenSign is a self‑hosted e‑signature platform that delivers the core capabilities of commercial services without licensing fees. It supports encrypted PDF signing, hand‑drawn or uploaded signatures, and unlimited document processing. Multi‑signer workflows let you invite participants, enforce signing order, and manage expirations or rejections.
Designed for developers, SMBs, and organizations with strict data‑residency needs, OpenSign can be deployed via Docker with a single command. The default MongoDB instance is transient, so production setups should supply a persistent MongoDB URL. Once running, users access a web UI, an integrated “OpenSign Drive” for storage, and RESTful APIs (plus Zapier) for custom integrations.
Beyond signing, the platform offers OTP verification for guest signers, customizable email templates, PDF template creation, detailed audit trails, and completion certificates. All features are open source, allowing full control over security, branding, and future extensions.
When teams consider OpenSign, these hosted platforms usually appear on the same shortlist.
Looking for a hosted option? These are the services engineering teams benchmark against before choosing open source.
Contract onboarding
HR sends employment contracts to multiple signers, tracks completion, and stores signed PDFs in OpenSign Drive.
Customer agreement automation
Sales teams generate PDF templates, trigger signing via API, and receive real‑time status updates.
Legal document review
Lawyers invite external parties, enforce sequential signing, and retain audit trails for compliance.
Integration with CRM
Through Zapier, signed documents are automatically attached to CRM records, streamlining workflow.
Yes, OpenSign is free and open source with no licensing fees.
It uses MongoDB; the default container is non‑persistent, so provide your own MongoDB URL for production data retention.
Yes, OpenSign offers a REST API and Zapier integration for connecting to external systems.
Documents are encrypted, guest signers must verify via OTP, and detailed audit trails with timestamps and IP addresses are recorded.
OpenSign is self‑hosted; you can deploy it on your own server using Docker or other supported methods.
Project at a glance
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