What tools do you use for your SaaS side hustle?

Hi all,

I want to get setup in the right way and I am looking for good tools to use for my SaaS side hustle. Ideally I want it to run itself but I know that isn't possible all of the time but I want to get close to it.

What does everyone use for:
• Onboarding
• Regular automated emails based on customer actions
• Marketing
• Support

I'd be interested to what is used and why.

Take care