You can pay for ngrok though (I don't believe there was a price forced, rather donate any amount (pay-what-you-want service as he states it). And the sites not

You can pay for ngrok though (I don't believe there was a price forced, rather donate any amount (pay-what-you-want service as he states it). And the sites not being online currently might probably have to do with inconshreveable (the author) updating it, as he stated in a tweet recently. Also, I'm not sure but did ngrok provide the endpoint over ssl?