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Top 23 Solidity Open-Source Projects
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union
The trust-minimized, zero-knowledge bridging protocol, designed for censorship resistance, extremely high security, and usage in decentralized finance. (by unionlabs)
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Project mention: I ran my Solidity scanner across the 10 most-audited codebases in web3. Here's every flag. | dev.to | 2026-07-21
git clone --depth 1 https://github.com/OpenZeppelin/openzeppelin-contracts /tmp/oz pipx run --spec git+https://github.com/juan23z/openclaw-audit openclaw-audit /tmp/oz # → 0 candidate observations across 247 client .sol contracts
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ethereumbook
Mastering Ethereum: 2nd Edition, by Andreas M. Antonopoulos, Gavin Wood, Carlo Parisi, Alessandro Mazza, Niccolò Pozzolini
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full-blockchain-solidity-course-js
Learn Blockchain, Solidity, and Full Stack Web3 Development with Javascript
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full-blockchain-solidity-course-py
Ultimate Solidity, Blockchain, and Smart Contract - Beginner to Expert Full Course | Python Edition
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DeFi-Developer-Road-Map
DeFi Developer roadmap is a curated Developer handbook which includes a list of the best tools for DApps development, resources and references!
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foundry
Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.
Project mention: Contrarian View: Vyper 0.3.10 Is Overhyped – Solidity 0.8.20 Is Better for Smart Contracts in 2026 | dev.to | 2026-04-29 -
hardhat
Hardhat is a development environment to compile, deploy, test, and debug your Ethereum software.
Project mention: Stop Guessing, Start Proving: A Guide to Stateful Fuzzing in Foundry | dev.to | 2026-04-27Hardhat
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Chainlink price feeds are the most widely adopted oracle solution in DeFi, securing over $65 billion in total value and serving 80% of DeFi protocols that require external price data. Each feed is a smart contract that returns a latest price, updated by a decentralized network of node operators when prices deviate beyond a threshold (typically 0.5-1%).
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DefiLab
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Older tools still matter inside AI Smart Contract Review. Slither describes itself as a static-analysis framework for Solidity and Vyper, with vulnerability detectors, confidence/impact categories, CI integration, and checklist output.
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mythril
Mythril is a symbolic-execution-based securty analysis tool for EVM bytecode. It detects security vulnerabilities in smart contracts built for Ethereum and other EVM-compatible blockchains.
Symbolic execution gives AI Smart Contract Review another boundary, not a magic proof. Mythril is valuable because symbolic execution can expose common EVM vulnerability classes, but bounded execution still lives inside assumptions about time, path depth, environment, and state space.
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project_web3.0
This is a code repository for the corresponding video tutorial. In this video, we're going to build a Web 3.0 React Solidity Blockchain Application
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solidity-patterns
A compilation of patterns and best practices for the smart contract programming language Solidity
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Project mention: Show HN: MCP support to guide smart contract fuzzing campaigns in Echidna | news.ycombinator.com | 2025-12-23
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remix-project
Remix is a browser-based compiler and IDE that enables users to build Ethereum contracts with Solidity language and to debug transactions.
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Solidity discussion
Solidity related posts
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I ran my Solidity scanner across the 10 most-audited codebases in web3. Here's every flag.
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Ophis: an intent-based DEX aggregator for humans and AI agents
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ENS Domains .eth .box
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AI Smart Contract Review: The Finding Is Not the Audit
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My Journey into Web3 Auditing
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How to Secure Your Multisig Wallet: Complete Hack Prevention Guide with Technical Analysis
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How a Single JavaScript File Bypassed a $1.5B Multi-Sig: Anatomy of the Bybit Hack
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A note from our sponsor - SaaSHub
www.saashub.com | 11 Aug 2026
Index
What are some of the best open-source Solidity projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | union | 73,874 |
| 2 | openzeppelin-contracts | 27,206 |
| 3 | solidity | 25,693 |
| 4 | ethereumbook | 21,519 |
| 5 | full-blockchain-solidity-course-js | 14,009 |
| 6 | full-blockchain-solidity-course-py | 11,204 |
| 7 | DeFi-Developer-Road-Map | 10,792 |
| 8 | foundry | 10,547 |
| 9 | hardhat | 8,498 |
| 10 | chainlink | 8,232 |
| 11 | awesome-solidity | 7,036 |
| 12 | DeFiHackLabs | 6,665 |
| 13 | slither | 6,338 |
| 14 | web3j | 5,389 |
| 15 | mythril | 4,260 |
| 16 | project_web3.0 | 4,252 |
| 17 | eattheblocks | 3,989 |
| 18 | free-Web3-resources | 3,665 |
| 19 | solady | 3,345 |
| 20 | solidity-patterns | 3,324 |
| 21 | echidna | 3,166 |
| 22 | remix-project | 3,032 |
| 23 | TypeChain | 2,797 |
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