Now, Polkadot DAO is the largest DAO in the world by total number of onchain wallets. 

The key features of Polkadot DAO:

1. At the core of DAO, there is a Polkadot Treasury. This treasury has a continuous fund source. 
2. OpenGov is the fully onchain governance system.
3. Any DOT holder can submit proposal, vote or delegate vote. Voting power depends on the amount of DOT committed to each decision. 
4. Conviction voting is there. It multiplies voting power when tokens are locked for longer periods. 
5. Technical Fellowship is a decentralised advisory group that provides expert guidance without creating bottlenecks.