I have created an app to visually build tech stacks on an interactive canvas.

You can browse the tools, add them to your diagram, and in real-time you get recommendations, which tells you whether the selected tools work well together, or what other tools can be added to complete the picture.

This is a start of a beta version - the visual builder is fully functional, the same as the tools catalogue. The rest, so user accounts, AI features and so on will be coming later.