What does Silta mean?

It means "bridge" in Finnish.

Can I use Silta outside of Wunder?

Yes, our code is open. However, we haven't put special attention to this use case at this point.

Does Silta support multisite?

This might be technically possible, but multisite setups provide little benefits in a container-based environment. Instead, it is recommended to trigger the deployment of multiple sites into dedicated environments from the same repository.