TradingView - The best charting tool for crypto and stocks
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
CryptoCompare - We bring you all the latest streaming pricing data in the world of cryptocurrencies.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
CoinMarketCap - Crypto-currency market capitalizations.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.