What's a good starter VAD lib, and if you know, the best implementation of something like this to use in a browser-based app? Say if I wanted to use it for Voi

What's a good starter VAD lib, and if you know, the best implementation of something like this to use in a browser-based app? Say if I wanted to use it for Voice Nav, or Voice Input, but not piss off random people speaking the wrong language.