If you don't want to run your own Lively installation locally then all it needs is a web browser.
If you want to run it locally via https://github.com/LivelyKernel/lively.installer then it should run well in MacOS and Linux. On Windows you might need to use a proper bash (e.g. git bash or the Ubuntu subsystem).
There is a desktop app for mac os that wraps the installer and gives you a menu bar entry for controlling the lively server but in the end it is just a frontend for what the installer does.
If you want to run it locally via https://github.com/LivelyKernel/lively.installer then it should run well in MacOS and Linux. On Windows you might need to use a proper bash (e.g. git bash or the Ubuntu subsystem).
There is a desktop app for mac os that wraps the installer and gives you a menu bar entry for controlling the lively server but in the end it is just a frontend for what the installer does.