This is an outdated list of collections of Solidity code. More information about smart contract programming languages can be found on ethereum.org.

• dapp-bin/library: A small collection of utility libraries.
• Density: Alex Beregszaszi's collection of useful modifiers and methods
• Solidity Standard Library: This is a proof-of-concept standard library that is included with Solidity itself.
• standard-contracts: Andreas Olofsson's collection of libraries that handle bits, bytes, encoding, decoding, and crypto.
• stringutils: Nick Johnson's string & slice utility library
• Zeppelin: OpenZeppelin library for writing secure smart contracts.