Free option is still there (listed below the plans).

Below the paid options:

  Free Plan
  For quick demos and other simple tunneling needs.
  * HTTP/TCP tunnels on random URLs/ports
  * 1 online ngrok process
  * 4 tunnels per ngrok process
  * 40 connections / minute

It seems the answer was there in the site and you guys answered between me thinking about it and posting the question. Should have refreshed before submitting my question :).

I'd rather pay a very small amount for something that does exactly what it says on the tin, every time, than some sketchy app that maybe works, or monetizes in weird ways by selling me or my traffic or whatever.

It's a professional tool with real use. That's worth money.