TiersPlus!

TiersPlus is the BETTER TierTagger! (Subject to user opinion-). Featuring mctiers.com, mctiers.io, ocetiers.net and more to come, this TierTagger also has beautiful icons!
All the code is available here, with the API being closed source, however reachable at api.yeahjenni.xyz.

Information on the API can be found at the Github here