There are 2 repositories under ethereum-contracts topic.
A starter boilerplate for an Ethereum dapp using web3.js v1.0, truffle, react, and parity
Static program analysis framework for Ethereum smart contract bytecode.
Sample ethereum contracts with full guide
useful common ethereum contract repository
CityDAO's Solidity smart contracts
ERC-1616 Attribute Registry Standard - interface, tests and implementation.
Ethereum Solidity Development Overview
Useful tools and services for finding vulnerabilities in a transaction to assess the risk of blockchain and various cryptocurrencies
Replicates Solidity math in Typescript
Ethereum smart contracts for etherep
Solidity/Ethereum dapp to qualify LP tokens as Uniswap or Balancer LPs
Interacts with this OPYN Protocol to fetch osQueeth and ETH^2 price statistics.
A sandbox crowdfunding dapp to practice Solidity development
We are Ethereum Utopia Citizens (EUC)
An Ethereum "town" crier, useful for anyone to make public announcements in ethereum's logs.
A Solidity smart contract that implements an analogue of cumulative voting, when each vote has a weight equal to the number of tokens in the possession of the voter.
Settle your electric payments via smart contract
FundRequest private seed code & contracts
Contracts in truffle
Official Ethereum Studio project repository. And IDE specially tailored to make it as simple as possible to on-board new users into the Ethereum ecosystem
Introduction to smart contract, Solidity language and ethereum ecosystem.