Signature GitHub Repositories (2026) · Open Source Tools

Cross-platform & feature rich iOS/iPadOS/tvOS sideloading application. Formerly known as PlumeImpactor.

Free on-device iOS/iPadOS application manager/installer, using certificates part of the Apple Developer Program.

pyHanko: sign and stamp PDF files

A modern, cross-platform OpenPGP tool with a unique dual-engine core: switch freely between the battle-tested GnuPG and a modern, memory-safe Rust rPGP backend. It makes encryption, signing, and key management easier and more trustworthy in everyday privacy workflows.

DIE engine

Signatures for entire Python programs. Extract the structure, the frame, the skeleton of your project, to generate API documentation or find breaking changes in your API.

JSON Web Tokens: JWS, JWE and JWK.

Cryptographic javascript-functions for ethereum and tutorials to use them with web3js and solidity

Invoicerr is a freelance-focused invoicing app that lets you create quotes, generate invoices, track payments, and collect secure signatures.

A cryptography/crypto library for Kotlin Multiplatform

Linker/Compiler/Tool detector for Windows, Linux and MacOS.

Simple to use OpenPGP API based on Bouncy Castle

Android Signature Pad is an Android library for drawing smooth signatures

A simple to use blazor component to draw custom signatures.

Control how your documents get signed