if you have a spare server connected to the Internet somewhere.
The source code can be found here, and I can guide you through every step of the installation process:
https://github.com/andreasrosdal/freeciv-web (This is the code I used to host Freeciv.net games on, so it should just work)
There's also a branch here, which is updated to the lastest freeciv.org svn trunk: https://github.com/cazfi/freeciv-web (not tested with live players yet)
I stopped hosting Freeciv.net myself because it was quite a lot of work and the server I rented was expensive.
But perhaps someone else in this forum are interested, and have a spare server that they want to host online Freeciv games on.

This is what Freeciv.net looks like:
