little side project I have build over the weekend, fully free to use. options position builder for about thousand liquid stocks, ETFs, BTC and ETH on Deribit and about forty CME and ICE futures. end of the day snapshots from all options chains so you can pick exact contracts, select different expirations, build all popular strategies, see impact of greeks and so on. for short vol positions there is also calculator for delta hedging, effective iv based on position fill and forecast rv analysis.(Adam)