Infura - Ethereum node as an API
BlockchainI.CO - Research, ratings and analysis on upcoming ICO’s
GetBlock.io - GetBlock provides developers with instant connection to full nodes of 40+ blockchains. Get access to BTC, ETH, BSC & other networks via API.
Coin Demo - Visual demonstration of how bitcoin transactions work
Alchemy - File conversion, all from the menu bar 🔮
Blockchain Startups Map - Map & searchable database of 430 companies in 64 categories.