Alchemy
Arc.js library facilitates development of "dApps" (Decentralized applications) for interacting with DAOs.
DAOstack has built its own dApp called Alchemy, a front-end interface for DAOs, or more specifically, for budget management in decentralized organizations. Alchemy allows end users to make collaborative budgeting decisions and allocations using the Holographic Consensus protocol.
You can find the Alchemy repo at github.com/daostack/alchemy.