Adrian Buckman shares some of his favorite creations:
sp_AGreconfigure
This is a great goto proc for an alternative to the Always on availability group GUI for changing Failover mode, Synchronous mode or even Readable options.
When you manage multiple servers with multiple Availability groups this stored procedure can save you alot of time, sometimes I find the GUI can take a long time to open but equally it can take some time to execute the command.
sp_AGreconfigure can speed this process up for you, we tend to use this as our goto for switching synchronous settings when patching/rebooting replicas but also I tend to use it in @Checkonly = 1 mode for giving the Availability group settings a once over.
Click through for this and several other useful tools.