I also would like to nominate @emrebeyler to be included as he's very active and created a barrage of different tools. Below isn't all of them, but just a few taken from his recent posts:

https://steemit.com/mutingproxy/@emrebeyler/muting-proxy-what-if-we-subscribe-to-other-accounts-muting-lists
https://steemit.com/utopian-io/@emrebeyler/introducing-dpoll-a-poll-app-on-the-top-of-steem-blockchain