ELROND ($EGLD) SPoS ecosystem was launched in 2017 (Genesis Block : July 30th, 2020)

Gas Token : $EGLD,  US$0.05 (swap)

Wallets* : Maiar (see my post " 5 reasons tu use Maiar"), Maiar DeFi (Chrome extension),  Ledger

Bridge :  Elrond Bridge (withdraw on Elrond ecosystem with Binance ), ...

Blockchain explorer : Elrond Scan 

Swap : Maiar Exchange 

Launchpad : Maiar Launchpad

Other : Unlock MEX before the locked period, Jexchange an alternative exchange

More information and protocols about ELROND ecosystem : Elrond docs , Elrond wiki (with possible "airdrop" but DYOR)

NB: This is non-exhaustive overview of the ecosystem and subject to change, it's my point of view and not investment advise.

Other ecosystem : Terra ($LUNA), BNB Chain (ex-BSC) ($BNB), Cosmos ($ATOM), Cardano ($ADA), Optimism, Arbitrum