I really don't know what I would do without them. These sites are ULTRA important for me.
Steem.supply is awesome for checking when your next payouts are due and current prices of SBD and STEEM, and steemd is important for checking your votingpower, reputation, vesting shares and many more. I just love this site ;-) It makes keeping up with all incoming and outgoing votes so easy.
If you did not know theese sites, this will change your steemit experience forever...