What's in your current technology tool stack?And are there any you couldn't imagine working without?

I love collecting and trying new tools for my consulting business - specifically in the client management, no code and marketing spaces. But I'm curious to know what other tools indiehackers have found most useful (not including the ones you've personally built 🙄😬) .

And if you had to get rid of them all with the exception of 1, which would it be and why?