Hi, I just released a new explorer for testnet, https://ilibraexplorer.com/ , hopefully it will be useful to you. See here for the initial announcement:
http://community.diem.com/t/ilibraexplorer-com-connecting-with-me/1224
I will use this topic for future updates related to testnet.
Added global stats and useful resources! 
Please let me know if there is something particular you would like to see next. Iām thinking about going deeper into stats, with some light plotting.
The Rich List feature is live!
Pretty weird Testnet reset, minter is now:
000000000000000000000000000000000000000000000000000000000a550c18
Updated with the new testnet.