CARDANO ($ADA),  PoS ecosystem (Ouroboros) was launched in 2017 (Genesis Block : September 29th, 2017)

Gas Token : $ADA 

Wallets* : Yoroi, ccvault (Chrome extension and Smartphone), Ledger

Bridge : Ardana (TBA) or withdraw on Cardano ecosystem with Binance , ...

Blockchain explorer : Cardano Blockchain Explorer

Swap : Sundaeswap, Muesliswap

Launchpad : Cardashift (TBA : see my post here)

Airdrop (*for stakers who delegate token)  : DripDropz

More information about CARDANO ecosystem : Cardanocube

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 ($LUNA), Elrond ($EGLD), BNB Chain (ex-BSC) ($BNB), Cosmos ($ATOM), Optimism, Arbitrum

Referral bonus (earn 10€, when start with 100 €) :  Another way to stake in one centralized platform for beginners is to manage your token with  Feel-Mining