Would be a free public shell account service based on #FreeBSD/#OpenBSD systems interesting for you? If yes, what would you run on it?
Please provide feedback, so @gyptazy can check if it makes sense to provide such a service (this is already available in a limited beta).
What to expect:
A free user login to a FreeBSD or #OpenBSD based system where multiple users can access it at the same time. You can do everything in your own home directory, run processes, open sockets, compile stuff etc. System is managed in general for you.
What you cannot do:
Make changes to the system in general, use low ports, install or modify things system wide.