Best SaaS tools for Indie Hackers?

I’m thinking of SaaS services with a good return on investment, especially the tools that will save time in marketing/growth - but not limited to that. Anything from content preparation tools, T&C generators, tech tools…

What are the tools that saved you a lot of time and why?

Here are some of mine:

• Notion - Docs, notes & tasks. It replaces multiple tools I used before saving me time by having everything in one place
• Postmark - for sending emails, I primarily like their documentation that provides a good guidance on how to ensure your email deliverability is top notch
• Gitlab - fairly simple to set up automated delivery, even the simplest projects usually have their pipelines
• PostHog - analytics platform I am thinking of using as it seems to strike a great balance for indie hackers

My list is mostly dev focused, but I would love to see some must have tools for departments.