The three things I will mention here aren't so much websites, but initiatives here on Steemit that can be beneficial.
The first one is the Remind Bot. Ever start looking at a post then realise you don't quite have time right now but don't want to forget to come back to it? Then remind bit is for you. I actually used it at the bottom of this post (then came back later to read and edit my post to enter. https://steemit.com/@remind.bot
The second is one I'm an enormous fan of, and for new users that like to comment on posts, it's almost imperative to have a account. Currently votes totalling less than 0.019 turn to "dust" on payout and you end up getting no reward. Dustsweeper combats this.
You send a small amount of Steem or SBD to dustsweeper, then it gets doubled, and used to upvote your comments/posts that have votes under the dust threshold to ensure they don't expire. You can check out the faq here https://steemit.com/dustsweeper/@dustsweeper/dustsweeper-faq
The final one I'll mention here is 's Redfish Power Up League - https://steemit.com/steem/@paulag/redfish-power-up-league-and-wall-of-fame-week-9. This is a great initiative for encouraging engagement and monitoring your growth here on Steemit. See how you're tracking each week as your account gets stronger.
Hopefully these meet entry criteria, but if not, I hope they help people learn more about what's available on the Steem blockchain.
RE: Contest: Tell us what tools every steemit author should know - 5 Steem Basic Income shares as prizes