External Tools
This a comprehensive list of tools I use for content creation.
D&D Beyond is a tool I use for practically everything. It's one of my favorite websites, and an excellent tool for managing and running D&D campaigns.
Tabletop simulator is hands down my most useful application. It is extremely helpful for D&D and running campaigns, and allows me to really increase the immersion for all campaigns.
Another very useful application. I typically use it as a stand-in for Tabletop Simulator when my players cannot access it for some reason. Great battle map hosting website that is great for increasing immersion. Highly recommend for web-based campaigns!