I’ve used SRP on a few projects, including for a large bank for the log in from their counter system. Once you get the algorithm sorted out it’s quite simple and it feels a whole lot better than some of the password storage systems I have seen (and still do see) implemented.

I’ll have to have a look at OPAQUE, which according to Wikipedia is a newer alternative to SRP.

Edit: Just noticed that there are quite a few more systems using these types of algorithms, including Apple HomeKit.