BSC ($BNB) PoSA ecosystem was launched in 2019 by Binance. (Genesis Block : April 18th, 2019)

Gas Token : $BNB, $BUSD (Stablecoin) from US$0.10 (transfer) or US$0.30 (swap), track gas with BscScan Gas Tracker or Cointool 

Wallets : Trust Wallet, Metamask (Chrome extension and Smartphone , search RPC here),  Ledger

Bridge :   Anyswap, Cbridge, Xpollinate, (withdraw on BSC ecosystem with Binance), ...

Blockchain explorer : BscScan

Swap : PancakeSwap, Ellipsis (stablecoin), Paraswap ( DEX aggregator), 

Lending : Venus 

Launchpad : BSCPad, Polkastarter (Launchpad on CEX Binance)

Yield Optimiser : Beefy, Harvest 

DeFi dashboard tracker : Yield Watch, Debank

More information about BSC ecosystem : Docs Binance, (some tools in my previous post) 

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),  Cosmos ($ATOM), Cardano ($ADA), Optimism, Arbitrum