(Latin for "window")
Fenestra is a tool for setting up a windowing environment. Specifically, at the moment it builds my very specific i3+polybar+supervisor config. It's however semi-generalisable, and could probably be refactored to not be entirely locked to my config, but I haven't gotten around to looking at that yet. It responds to events (USB changes, screen changes, network interface changes) to decide to reconfigure things (e.g. changing screen layouts).
It uses Supervisor as a session manager (as i3 doesn't really have one natively).