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Devices like routers always have a web-based administrative interface that allows you to configure many aspects of the device from a web browser. Obviously, this is essentially a web server running on the embedded devices, where requests to the web site carry out different tasks.
I was wondering whether there was a free (both for personal and commercial use) web admin interface that can be installed on embedded devices and allows pages to be added/customised.
This mostly depends on how much resources your embedded device has.
For example, on ESP8266 devices your options are limited to your own application and C (possibly Lua) programming. There are no resources to run anything else.
On a devices like Onion Omega2 with 32Mb flash and 128Mb RAM you can install LuCi (thx!) from OpenWRT, and add more pages using a scripting language like Lua or Python.
Finally on a larger devices like Raspberry PI Zero with 512+Mb RAM and multi-gigabyte storage you can use something like Webmin.
Many of these are already based on a script-extensible free program, for example LuCI which is a packaged option in distributions of OpenWRT and perhaps other Linuxes intended for routers.
OpenWRT web interface documentation is at:
