1Inch - DEX - Access the most liquidity, lowest slippage and best exchange rates across Ethereum, Binance Smart Chain, Polygon, Optimistic Ethereum (OΞ) and Arbitrum. You can place limit orders on this with coins in Metamask.
BarterTrade - Exchange
BigOne (NO US!) - NoN US exchange. Don't send your money there. I did and that's why it's on here.
Binance - Perhaps the largest exchange. This links to the US version
CoinCheckUp - Crypto info
CoinGecko - Crypto info
CoinMarketCap - Crypto info
CoinToBuy - Compare multiple coins. Great tool
CryptoBubbles - Crypto info
CryptoMiso - Github commit history of 340 cryptocurrencies based on most popular repo
DefiPulse - Crypto info
FiatLeak - Graphical display of crypto being purchased
HotBit - Seems shady - be careful
Kucoin - Exchange
Lunarcrush - Social ratings for crypto
Marketcapof - Compare price / market cap of 2 tokens
Messari.io - Market research site.
Polygon Bridge - Polygon blockchain stuff
Pro.coinbase - Exchange
TradingView - Charting and Technical Analysis
Zerion - Look at all of the activity on an Eth address - also shows polygon and bcs