esign

Trexo PDF Signer is a professional-grade, open-source application designed for creating legally binding digital signatures on PDF documents. Built with enterprise security standards in mind, it provides seamless integration with hardware security modules (HSM), software certificates, and native platform keystores.

支付宝租赁业务管理系统：商品、订单、电子签约、分期账单与运营管理 | Alipay rental operations, e-signing & installment bills

Official SignNow SDK for Java. Sign documents, request eSignatures, and build role-based multi-signer workflows via REST API.

The Official SignNow Java Client Library for interacting with SignNow REST API. Sign documents, request e-signatures, and build role-based workflows with multiple signers using this client. https://www.signnow.com/developers

This repository contains a variety of code examples for working with BoldSign eSignature API, and this code examples are built with Angular and Java.

PapSign electronic signature and cryptography SDK.

Standalone PDF digital-signature library for the JVM — PAdES/CMS signing (PFX/PEM, deferred eSign/HSM/token), RFC-3161 timestamps, long-term validation, and a green-tick verified appearance Adobe shows as valid. Pure Java, one Maven dependency.

An open-source document execution engine. Bring your own CCA-licensed CA for eSign.

Sign.Plus API Java SDK