Looks really nice, similar to draw.io but a bit cleaner designs. I would recommend making the default sign up flow friendlier to AWS and GCP users. Right now figuring out how to add those libraries is hard.

Also I would highly recommend more top level groups (AWS, Azure etc...) instead of having each type of service for each cloud on a new side tab. Basically make it more hierarchical.

Finally, make everything collapsed by default. Having dozens of tabs expanded on start is annoying to say the least.