OpenSign

OpenSign is the open-source alternative to DocuSign—unlimited free e-signatures, forever, with source code transparency. Deploy on your own servers or use their cloud; sign and store unlimited PDFs at no cost. Every signature includes a tamper-proof completion certificate with audit logs. For indie hackers paranoid about vendor lock-in or SaaS pricing spirals, OpenSign's open-source model (MIT license) means you own your infrastructure and data.\n\nThe free cloud version rivals Inkless (unlimited free signatures) but with the added benefit of self-hosting. No watermarks, no feature limits, no seat caps. The community is growing, but it's smaller than DocuSign, so expect less polish. Ideal for indie SaaS founders, freelancers, and consultants who value data sovereignty and transparency over enterprise features. Zero cost to deploy; only optional paid support if you need help.