Media files are proprietary and it’s under the zlib license if that disqualifies anything, but for a somewhat decent experience, there is H-Craft Championship. Not the greatest of games considering it’s a game that originally released in 2007 as a commercial game available for Linux (don’t know about other platforms outside of the 2015 open source(?) release) by some seemingly random independent studio (Irrgheist), but fun enough I guess.
There is Neocities and a few other sites that allow you to make and share your own sites. Though some sites are more than just basic html, so experience will vary, but you can find basic pages dedicated to hobbies and such if you sift through them. Only problem with these sites/services, assuming the other ones are run like Neocities, is that you are given a pretty limited amount of space.