Open-source alternatives to Web3.js

Stellar Core is the primary software implementation of the Stellar blockchain network, serving as a distributed ledger and a Federated Byzantine Agreement system. It functions as a core node that maintains the shared state of the network and provides a runtime environment for executing WebAssembly smart contracts. The project enables the creation and management of digital assets, including the implementation of decentralized exchanges through distributed orderbooks and automated liquidity pools. It facilitates cross-border payment settlement by routing assets via path payments and bridging di

Remix is a comprehensive blockchain development environment and Ethereum smart contract IDE. It provides a complete workspace for writing, compiling, deploying, and debugging smart contracts across simulated and public blockchain networks. The project distinguishes itself as a specialized toolchain for EVM debugging and analysis, offering opcode-level transaction stepping and state memory analysis. It also includes a dedicated zero-knowledge proof toolchain for compiling ZK circuits and generating cryptographic proofs, alongside an AI-powered coding assistant for code generation and explanati

OpenZeppelin Contracts is a library of modular, secure, and reusable smart contract components designed for the development of decentralized applications. It provides a foundational framework for building standard-compliant contracts, offering battle-tested implementations for token standards, access control, and common utility patterns. The project distinguishes itself through its comprehensive support for complex architectural patterns, including proxy-based upgradeability, role-based access control, and account abstraction. It enables developers to implement modular logic injection via hoo

This project is a Rust SDK and client library for the Fuel blockchain. It serves as a smart contract development kit used to compile, deploy, and test blockchain contracts in both local and remote environments. The library includes a binding generator that creates type-safe Rust code from contract methods, ensuring compile-time safety for blockchain function calls. It also provides a local sandbox runtime to launch network nodes and simulate wallet activity for decentralized application testing. The toolset covers blockchain wallet management, transaction signing, and state querying through

This project serves as a comprehensive educational roadmap and technical resource collection for developers building decentralized finance applications. It provides a structured curriculum that guides users through the entire lifecycle of blockchain development, from mastering smart contract architecture and security best practices to integrating decentralized infrastructure into modern web applications. The repository distinguishes itself by offering a holistic view of the decentralized ecosystem, bridging the gap between low-level protocol interaction and high-level application design. It c

Foundry is an Ethereum smart contract development toolkit and blockchain simulator designed for compiling, testing, and deploying contracts for the Ethereum Virtual Machine. It provides a local environment for simulating blockchain state and forking live networks to execute code without modifying the actual chain. The project features a property-based fuzzing engine to identify edge-case failures in contract logic and a transaction debugger for analyzing detailed execution traces and gas consumption. It enables developers to mirror the state of a remote chain locally to test against real-worl

ethers.js is an Ethereum JavaScript library used to interact with the Ethereum blockchain by querying state and sending transactions via JSON-RPC providers. It functions as a smart contract wrapper, a Web3 provider interface, and a system for managing wallets and cryptographic signatures. The project provides a dedicated Ethereum Name Service resolver for translating human-readable names into blockchain addresses through forward and reverse lookup operations. It also includes an implementation for managing private keys and mnemonic phrases to sign digital data and authorize on-chain transacti

Wagmi is a collection of reactive hooks and a toolkit for interacting with Ethereum blockchains. It provides a comprehensive suite of primitives for managing wallet connections, reading smart contract data, and orchestrating on-chain transactions. The project distinguishes itself through a smart contract interface toolkit that retrieves binary interfaces to generate type-safe hooks and function wrappers. This ensures that blockchain inputs and outputs are validated at compile-time. It also features a specialized utility for translating Ethereum Name Service domains into wallet addresses and p

Geth is a comprehensive execution client for the Ethereum network, serving as a foundational node implementation that processes transactions, maintains the distributed ledger state, and participates in peer-to-peer consensus. It provides a robust infrastructure for synchronizing, validating, and serving blockchain data, utilizing a persistent Merkle Patricia Trie database to ensure the cryptographic integrity of historical records. As a sandboxed smart contract runtime, it executes bytecode according to deterministic protocol rules, enabling the deployment and interaction of decentralized appl

Hardhat is a smart contract development framework and EVM tooling suite designed for the full lifecycle of Ethereum and EVM-compatible applications. It serves as a development environment for compiling, testing, and deploying smart contracts, providing a local blockchain simulation and a programmable task runner. The framework is distinguished by its extensive simulation capabilities, including the ability to fork remote network state and manipulate block time or account balances. It features a hook-based plugin system that allows for the extension of core functionality and the creation of cu

Solana Web3.js is a TypeScript and JavaScript client library for interacting with the Solana blockchain. It functions as a web3 client that provides an RPC wrapper for managing network requests and a toolkit for querying account state and executing on-chain program instructions. The library includes a specialized cryptography interface for generating key pairs and performing asynchronous signing and verification using web cryptography standards. It also provides a serialization tool for encoding and decoding data between JavaScript objects and byte buffers to match on-chain program state. Th

Shardeum is an autoscaling blockchain infrastructure designed to distribute network workloads across multiple shards to increase throughput. It uses a dynamic-sharding architecture that horizontally scales node capacity and adjusts the number of active shards based on real-time network demand. The system features an execution environment compatible with the Ethereum Virtual Machine, allowing it to run smart contracts and decentralized applications. It maintains network agreement and security through consensus-group partitioning, which organizes validator nodes into discrete groups. The platf

This project is a collection of blockchain tools providing an Ethereum client node, a virtual machine runtime for smart contract execution, a blockchain wallet manager, and a programmatic network interface. It implements the necessary components to synchronize blockchain state, validate blocks, and process transactions on the Ethereum network. The software includes a dedicated command line interface for managing node operations and monitoring network status. It features a comprehensive suite of cryptographic utilities for generating account keypairs, managing encrypted secret stores, and sign

Web3.py is a Python library that provides a comprehensive interface for interacting with the Ethereum blockchain. It functions as a JSON-RPC client, allowing applications to connect to blockchain nodes via HTTP, WebSocket, or IPC to read network state and send transactions. The library includes a dedicated smart contract interface that uses Application Binary Interface definitions to deploy contracts and execute on-chain functions. It also features a cryptography toolkit for signing transactions and hashing data with Keccak, alongside utilities for translating Ethereum Name Service domain nam

fuels-ts is a TypeScript SDK and development toolkit for the Fuel blockchain. It provides a library for executing transactions and querying blockchain state, alongside a set of utilities for smart contract development and deployment. The toolkit includes a local blockchain node runner that supports hot-reloading to enable rapid testing and iteration. It further distinguishes itself by generating type-safe TypeScript definitions from smart contract specifications to ensure compile-time validation of function calls. The project covers a broad range of capabilities including wallet derivation u

Lnd is a full implementation of the Lightning Network protocol, functioning as a Bitcoin Layer 2 daemon that manages payment channels and settles transactions on the Bitcoin blockchain. It serves as an off-chain payment processor and a cryptographic wallet manager, enabling the execution of instant, scalable transactions through a network node. The project distinguishes itself through a focus on secure node networking and programmatic control. It provides gRPC and REST API servers for automating payment workflows and utilizes macaroon-based authorization to delegate granular permissions via c

Rotki is a local-first financial management suite designed for cryptocurrency portfolio tracking, tax accounting, and decentralized finance analytics. It functions as a self-hosted application that secures all financial records, transaction history, and user credentials within an encrypted local database, ensuring that sensitive data remains entirely under user control. The platform distinguishes itself through a privacy-preserving architecture that eliminates reliance on centralized cloud storage or third-party data providers. Users maintain full control over their connectivity by configurin

Web3j is a Java and Android library designed to integrate applications with Ethereum blockchain clients. It provides a JSON-RPC client for reading chain data and submitting transactions, a smart contract wrapper generator that creates native Java code from contract definitions, and a programmatic wallet manager for handling cryptographic keys and signing transactions. The project distinguishes itself through a template-based wrapper generation system that allows for type-safe interaction with on-chain contracts. It also includes a dedicated toolset for translating human-readable domain names

Bitcore is a blockchain development framework and a set of libraries used to build applications that interact with the Bitcoin network and other blockchain protocols. It provides a multi-chain cryptocurrency wallet implementation, a peer-to-peer client for synchronizing distributed ledger data, and a transaction orchestrator for constructing, signing, and broadcasting transactions. The framework features a standardized JSON-RPC wrapper to normalize communication between applications and diverse blockchain node APIs. It implements hierarchical deterministic wallets that derive keys and address

This project is a blockchain node software implementation that maintains a decentralized ledger using the Ouroboros proof-of-stake consensus protocol. It provides a complete environment for operating a distributed record, including a cryptocurrency wallet backend and a peer-to-peer network layer. The system is distinguished by its use of a UTXO-based ledger model and a diffusion-based state synchronization layer for node communication. It integrates a Public Key Infrastructure with TLS-authenticated communication to secure inter-node traffic and employs hierarchical deterministic key derivati

Substrate is a modular blockchain development framework used to build customized blockchain networks with programmable state transitions and consensus mechanisms. It functions as a toolkit for constructing bespoke network protocols and deploying nodes to local environments or global testnets. The framework utilizes a WebAssembly runtime environment to execute state transition logic, ensuring deterministic behavior across all network nodes. It enables the composition of modular logic components and runtime palettes to define the specific rules and behavior of a blockchain. The system covers c

Solana is a high-performance blockchain platform designed for decentralized applications and global financial systems. It provides a distributed ledger infrastructure that utilizes proof-of-stake consensus to maintain network integrity and secure digital assets. The platform includes a specialized runtime environment for executing smart contracts and a framework for developing programs in Rust. The system distinguishes itself through a suite of architectural components that enable high-throughput transaction processing. It employs a cryptographic clock mechanism to sequence transactions befor

ink-kit is a React-based component library and UI kit designed specifically for building the frontends of onchain applications. It provides a set of themed layouts and reusable UI elements tailored for decentralized application user experiences. The project includes a standardized blockchain wallet connector to manage identities and allow users to link cryptocurrency wallets to a web application. It combines these identity tools with pre-styled components to facilitate the development of web3 user interfaces.

web3-react is a React framework for building decentralized applications that connect to Ethereum wallets and read blockchain state. It provides a unified interface for wallet connection management, enabling Ethereum dApp development through a collection of hooks and providers that abstract away provider-specific logic. The library is built around a connector plugin architecture that normalizes interactions across different Ethereum networks and wallet implementations. It distributes blockchain state through React Context and synchronizes state reactively by subscribing to provider events like

AppKit is a multi-chain wallet connection kit and onboarding framework designed to integrate diverse blockchain networks into a unified interface. It provides a comprehensive suite for connecting applications to EVM, Solana, Bitcoin, TON, and TRON ecosystems, facilitating both self-custodial wallet linking and the creation of new accounts. The project distinguishes itself through a Web3 onboarding system that utilizes social and email-based authentication to generate embedded wallets, reducing cryptographic friction for new users. It further supports advanced identity management via a blockch

This project provides a collection of infrastructure components for multichain wallet integration, including a cryptographic library for cross-chain transaction signing and a curated repository for cryptocurrency asset metadata. It serves as a central hub for managing token logos, contract addresses, and technical specifications for digital assets across multiple blockchains. The system includes a Model Context Protocol server that exposes real-time blockchain data and technical documentation to large language models. It further extends this AI integration by providing a standardized tool-cal

This project is an Ethereum wallet browser extension that serves as a blockchain identity manager and a bridge between decentralized applications and the Ethereum blockchain. It functions as a multi-network blockchain wallet, allowing users to manage digital keys and interact with various Ethereum-compatible network ecosystems. The software provides a provider interface for signing transactions and reading chain data. It enables users to switch between different blockchain networks and maintain secure identities to authenticate on decentralized networks. The system covers the management of w