There are many steemit tools which maybe useful for a particular task but these 3 I use them everyday ,
STEEM.SUPPLY
This site allows you to see your potential payout categorized in two sections , payout from Posts and payout from Comments.
One thing to remember when using this tool is that it shows 75% of the value currently showing in steemit .
STEAMVP.COM
Steamvp lets you keep track of your upvoters.
This tool can be very useful as it can allow you to know who your loyal upvoters are as it also the number of time a person upvoted and amount of sbd you made from their upvotes.
just enter your username and you are good to go
STEEMD.COM
Steemd is a blockchain explorer , you can find any information about the account , just like other tools enter your username Information I like to see
who unfollowed me
who upvoted with how much voting power
If any tools which you find useful please mention in the comment