TradingView - The best charting tool for crypto and stocks
500 Coins - A forever changing list of the Top 500 Cryptocurrencies
Bitcoin Flip - Trading Simulator for all the popular crypto currencies.
CryptoBuzz - Hacker News for Crypto
Cryptonose - Cryptonose is a desktop application tracking significant price changes and giving an alerts for crypto markets in real-time. It's helpful if you are a daily trader and want to know instantly if something interesting is happening on your exchange.
Dead Coins - Curated list of cryptocurrencies forgotten by this world