Which programming languages does ActyxOS support?

You can use any language you want with the Docker Runtime and any transcompile-to-Javascript language with the WebView Runtime

The Docker Runtime runs one or more docker containers on an edge device. You are free to build any docker image you want—if it builds, it runs.

For the WebView Runtime, you can use any language that transcompiles to Javascript. Examples include:

Interacting with the Event Service, the Blob Service and the Console Service happens via their respective HTTP APIs. This means you can use any HTTP request library for interacting with the services from your language of choice.