This is by no means an exhaustive list, just a smattering of some of the bigger projects doing neat things.
The graph protocol - decentralized blockchain indexing feeding a network of graphQL servers hosting the data powering dapps https://thegraph.com/en/
Chainlink - decentralized on-chain oracles for basically any piece of data from the real world - https://chain.link/
MakerDAO - creator of the first “soft pegged” stablecoin, it is a series of smart contracts that allow people to lock up crypto as collateral and mint DAI, uses a number of neat and novel mechanisms to keep peg by adjusting interest rates and incentivizing economic behavior https://makerdao.com/en/
Compound - a decentralized lending and borrowing protocol with no centralized authority handling liquidations/collateral pricing/etc. https://compound.finance/
Uniswap - a decentralized exchange for swapping assets in a trustless way, has neat features like flash loans where you can borrow a large amount of money (millions of dollars) for the length of one transaction, as long as the money is returned with a fee. This allows anyone to do things like capture arbitrage opportunities, liquidate large positions, or whatever else can be done in one transaction. https://uniswap.org/faq
A lot of these are DAOs using smart contracts to propose and vote on binding proposals on chain and adjust parameters within the protocol or paying contributors and whatnot. You can see an example here https://compound.finance/governance
Beyond that there’s other blockchains focused on specific use cases like GameFi, bridges connecting together different blockchains and moving liquidity between them in a mostly seamless way, massive research attention being paid to zero knowledge proofs (which have a lot of potential implications in the real world), and multi-sig contracts for only doing things when a quorum of key holders come together and signal their intent.
The graph protocol - decentralized blockchain indexing feeding a network of graphQL servers hosting the data powering dapps https://thegraph.com/en/
Chainlink - decentralized on-chain oracles for basically any piece of data from the real world - https://chain.link/
MakerDAO - creator of the first “soft pegged” stablecoin, it is a series of smart contracts that allow people to lock up crypto as collateral and mint DAI, uses a number of neat and novel mechanisms to keep peg by adjusting interest rates and incentivizing economic behavior https://makerdao.com/en/
Compound - a decentralized lending and borrowing protocol with no centralized authority handling liquidations/collateral pricing/etc. https://compound.finance/
Uniswap - a decentralized exchange for swapping assets in a trustless way, has neat features like flash loans where you can borrow a large amount of money (millions of dollars) for the length of one transaction, as long as the money is returned with a fee. This allows anyone to do things like capture arbitrage opportunities, liquidate large positions, or whatever else can be done in one transaction. https://uniswap.org/faq
A lot of these are DAOs using smart contracts to propose and vote on binding proposals on chain and adjust parameters within the protocol or paying contributors and whatnot. You can see an example here https://compound.finance/governance
Beyond that there’s other blockchains focused on specific use cases like GameFi, bridges connecting together different blockchains and moving liquidity between them in a mostly seamless way, massive research attention being paid to zero knowledge proofs (which have a lot of potential implications in the real world), and multi-sig contracts for only doing things when a quorum of key holders come together and signal their intent.