My favorite Steem based app/service would currently have to be the eSteem App.. There are many many apps/services that I've loved from the simple potential payout apps to the whale trackers, award payment tracking etc..

What the eSteem app has done for me is allow me to gain some pretty decent commenting rewards as a struggling minnow. My posts rarley will generate many views or rewards no matter how detailed or well written they are. However when using the eSteem app to comment and engage in conversation I have been blessed all to often by receiving the app creators upvotes which generate .24 - .27 SBD for me typically just for using the app to comment - which seems to also draw more upvotes from others.

Find a more in depth discussion on the nominal effects the eSteem app has had in this post - especially in the comment discussion from a few weeks ago - https://steemit.com/steemit/@krytonika/creating-content-vs-commenting-for-minnows-is-this-the-question-or-answer

What I'd like to see more apps/services of being created is apps that are tailored more to simply helping minnows get acclimated to STEEMIT, helping them receive some small rewards in the beginning weeks of joining, and helping them to excel as a contributing member of the community so our entire community numbers continue to grow and allow STEEMIT to evolve into what is destined to be

Much thanks to @good-karma