Some of My Favorite Tools
Jupyter Lab. A great tool for interactive code interaction in dozens of languages. I use it primarily for setting up analysis workflows in Python or R.
Docker Hub. I used to use VMs to set up specific environments (databases, web pages, or just to explore new open source libaries). Nowadays I turn to a docker container to do the same thing, but in much less time. There is just about everything you will need on Docker Hub, but if you need to dive deeper, or "roll your own", you'll want to learn more about the tool itself (docker).
Docker. The rabbit hole goes a little deep on this one, especially once you discover what you can do here. Microservices. High reliability apps with Docker Swarm (try Swarm before you dive into Kubernetes). Docker for Windows (it's come a long way, though if it can be done in Linux, it's still less problematic).
IHMC CMAP Tools. If you haven't tried mind mapping, it will surprise you when you use it for the first time, just to see how much "stream of consciousness" thinking can be captured, either in a collaborative group, or even brainstorming on your own. The tool is very intuitive, and allows you to drag and drop files, links, and just about anything can be customized to turn a raw mind map into a knowledge repository.
Ansible. Amazing what you can automate from a single platform, just using the built in ssh capability, and Ansible's open source framework. Check out Ansible Galaxy just to get an idea of what's possible.