The best way to learn to learn deeply about bitcoin is to avoid GUIs (even bitcoin-qt), and instead learn it from the command line.

Javascript Bitcoin Wallet. Supports Multisig, Stealth, HD, SegWit, Bech32, Time Locked Addresses, RBF and more!

Ethereum MultiSigWallet

Protecting cryptographic signing keys and seed secrets with Multi-Party Computation.

WARNING: This project is no longer maintained. Please, use bitcore-lib-cash instead.

Chance Bitcoin Wallet——swift opensource bitcoin wallet

Rust library for BLS signatures, MuSig, PS signatures

✍️ A Solidity library for verifying Ethereum message multi-signatures.

🔐 App to manage and interact with the Gnosis Safe

NEM Blockchain Bot for Node.js applications

Cooperative RSA signing

42-coin integration/staging tree

Multisig with a command-line interface

multisig wallet

Pixel: Forward secure multi-signatures and threshold signatures

⚠️ Experimental ⚠️ multisig wallet module with web UI for Substrate/Polkadot blockchains.

IOTAcooler, the IOTA Cold Transaction Signer

Multi-signature security on the Stellar network for Android. 🔑🗝️🔑

🔐 App to manage and interact with Gnosis MultiSig Wallets https://wallet.gnosis.pm

bcoin compatible multisig wallet server

A Decentralized Lead Sharing Network​

The most advanced multisig bitcoin wallet optimized for collaboration.

JavaScript bindings for Melis API

nem2-sdk for browser

Fin Tech: Home of the TripleShibe, the decentralized 3-person Dogecoin wallet.

Blockchain Based Certificate Validation