For the next sbc I am working on a quorum monitor/explorer for stellarbeat.io. You can check out the first version at https://stellarbeat.io/quorum-monitor
The quorum monitor gives more insight into the quorum set connections of the stellar network, active nodes, failing validators, clusters,... It also allows you to toggle nodes on/off and see the effects on the network.
Stellarbeat.io has also undergone a complete redesign and all code is now open-source at https://github.com/stellarbeat
All data that stellarbeat uses is now available through https://api.stellarbeat.io.
Feedback, ideas, suggestions,... are very welcome!