- Gadget Ethernet [DHCP and fixed at 169.254.3.14] so even if you mess up networking, you can plug it into your laptop and be able to fix it.
- HostAPD to provide a dedicated WiFi network (even over the same onboard ethernet). I use this with my MaslowCNC to have a reliable WiFi connection to my phone for controlling the router even if the upstream goes away. Default WiFi WPA2 password: raspberry
- openNDS- With a bit of hosts magic so it can run offline as well. This way as soon as you connect to it, the device's webpage will appear (maybe in a security browser, but...)