MapStructur is a standalone visual map editor meant for self-hosted environments. Unlike SaaS diagram tools, it runs entirely locally (via Docker) and stores data in plain JSON.

Useful for:

Network topology maps

Floor plans and logistics

Escape room design

Asset visualization on custom backgrounds

No external dependencies, no tracking, no vendor lock-in. Source code: https://github.com/IT-4-ALL/mapstructur

If you're looking for a lightweight alternative to tools like Lucidchart or Miro (but fully under your control), this might be worth exploring.