ngrok is free to use for limited features. However, the pricing can be referred from their official website. I have already shared the URL. Others are free.
I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
It will be nice if you add pricing for each services above.
ngrok is free to use for limited features. However, the pricing can be referred from their official website. I have already shared the URL. Others are free.
They're all free unless you want to do "advanced" things with them.