These blockchains have more development than you might think...
@chainspect_app's developer dashboard shows data on how many developers are currently active on each chain, featuring expected names like
@Ethereum $ETH and
@Solana $SOL.
However, it also details some chains with impressive developer numbers, but that are less widely known than the aforementioned chains...
@Polkadot $DOT [9,066]
@Cardano $ADA [3,726]
@0xPolygon $POL [1,811]
@hedera $HBAR [1,325]
@NEARProtocol $NEAR [1,216]