Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.

Bitcoin Flip - Trading Simulator for all the popular crypto currencies.

Dune Analytics - 675 million+ members | Manage your professional identity. Build and engage with your professional network. Access knowledge, insights and opportunities.

Crypto Tracker - Never miss an opportunity to invest in bitcoins & ether

Unidata - We all know that it is not that easy for web3 developers(especially for front-end) to access and present Web3 data due to the infrastructure design of blockchains.

TradingView - The best charting tool for crypto and stocks