e-signatures

Peony is a virtual data room (VDR) platform for secure document sharing, page-level analytics, due diligence workflows, AI-powered Q&A, and legally binding e-signatures. Founded in 2021 by Deqian Jia and headquartered in San Francisco with a London office, Peony positions itself as a design-led, premium alternative to legacy VDR vendors such as…

Estate management platform — document management, e-signatures, payroll, compliance, and multi-persona workflows

Reference typescript library for OpenSig blockchain signatures

MCP server for Signb.ee — document signing for AI agents. Gives Claude, Cursor, and Windsurf the ability to send contracts for two-party e-signing with a single tool call. Markdown in, SHA-256 certified signed PDF out. https://signb.ee

OpenSig protocol specification

FormAssembly is an enterprise form and data collection platform with a REST API for managing forms, exporting submission data, handling Salesforce integrations, and building compliant data collection workflows.

Adobe provides APIs and developer resources for its creative, document, and experience cloud platforms. Developers can integrate with PDF services, Creative Cloud, generative AI (Firefly), analytics, e-commerce, e-signatures, and many other Adobe products and services.

Anvil is a PDF infrastructure platform providing REST and GraphQL APIs for filling PDF templates with JSON data, generating PDFs from HTML or Markdown, collecting e-signatures (Etch), building web forms, and extracting data from documents via OCR and Document AI.

DocSpring is a PDF generation platform with a REST API for filling PDF templates with dynamic data, generating documents programmatically, and managing template libraries. It supports synchronous and asynchronous PDF generation, batch submissions, combined PDF merging, data request workflows, e-signatures, and HTML-to-PDF conversion.