BarterDEX coins & assets:
http://atomicexplorer.com/

KMD:
http://kmd.explorer.supernet.org/
http://www.kmdexplorer.ru/ (thanks @decker)
http://kmd.komodochainz.info (thanks @metaphilibert)

Others:
http://MSHARK.explorer.supernet.org
http://revs.explorer.supernet.org
http://SUPERNET.explorer.supernet.org
http://DEX.explorer.supernet.org
http://PANGEA.explorer.supernet.org
http://JUMBLR.explorer.supernet.org
http://BET.explorer.supernet.org
http://CRYPTO.explorer.supernet.org
http://HODL.explorer.supernet.org
http://SHARK.explorer.supernet.org
https://shark.kmdexplorer.ru
https://mshark.kmdexplorer.ru
http://BOTS.explorer.supernet.org
http://MGW.explorer.supernet.org
https://mgw.kmdexplorer.ru
http://MVP.explorer.supernet.org
http://WIRELESS.explorer.supernet.org
http://KV.explorer.supernet.org
http://CEAL.explorer.supernet.org
http://MESH.explorer.supernet.org
http://CHIPS1.explorer.supernet.org
http://CHIPS2.explorer.supernet.org
http://CHIPS3.explorer.supernet.org

https://explorer.coqui.cash/
https://coqui.kmdexplorer.ru/