Nice. :D
The @qurator is a service for quality content curation.
Once you register you get some upvotes while creating quality posts. Your post might also be featured in "The daily qurator" which is something like a handpicked daily news - post containing quality content from different users...
Now you'll have to look it up for your self, because this is how far my knowledge goes. :)

The @treeplanter is a charity upvote service...

c/p
"50% of it is going directly to Cameroon to fund our conservation program to save Abongphen Highland Forest
50% will help me to grow and get more STEEM POWER to share more happiness and money on Steemit to you Steemians. e.g. If you send me 1 SBD I will divide it and use half (0.5 SBD) for tree planting (you plant 0.5 tree) and the second half to power me up.
EACH DOLLAR (sent to Cameroon) = 1 TREE PLANTED"

And it's only meant as a gift amongst steemians, a.k.a. you can not upvote your own posts with it. :)

I hope I was helpful. If there is anything else, I'm glad to help.