One tool I could not live without. Which one is yours?

So, I guess we all have one digital tool we just cant live without, mine is Canva and I pay for the premium version because yeah, I just could not live without it. https://partner.canva.com/DYeVGAll

For all my projects I have made logos there, all marketing material and free photos/videos.

Which tool can't you live without? :)