There’s a service https://tunnelto.dev/ which I’ve used in the past. It’s an ngrok alternative for exposing local services publically for things like demos, testing, etc. I heard about tunnelto.dev when it was announced on Hacker News and gave it a try along with several others on my team at Osmos. It looked fresh, was written Rust, and was at least partially open source - all great. I even signed up for the (very cheap) paid plan which gives custom subdomains and some other stuff.

Background I recently had the need to build a custom renderer for graphs generated by graphviz for a project visualizing computation graphs for RNNs. Graphviz has an output format called plain and plain-ext which generates a very simple text-based layout specification for all nodes and edges in the input graph. It’s pretty well spec’d out in the official docs for the most part: https://graphviz.org/docs/outputs/plain/. Here’s an example of what plain-ext output format looks like for a simple graph: