Mempool statistics https://jochen-hoenicke.de
Sentiment analysis https://alternative.me/crypto/fear-and-greed-index/ Sentiment Fear/Greed
Open interest (Big Funds) https://bitgur.com/chart/interest
Open interest chart https://bitmexresources.com/
Aggregated (combined) open interest https://skew.com/dashboard/bitcoin-futures
Realtime Volume Monitor and more https://www.cryptometer.io/v2/btc_xbt_monitor
Open Interest Binance
Market depth ratio
Holy Grail for statistics All in one.
https://www.cryptomiso.com Which projects are hard at work?
long term investment tool https://www.lookintobitcoin.com/charts/bitcoin-investor-tool/
Most comprehensive set of tools for long-term investing ever.
Bitcoin Economics (must read) https://diar.co/bitcoin/