there's a host your own version thats available now https://fossilrepo.dev live server (demo) in fossilrepo.io which is a modern wrapper UI. There's also the standard https://fossil-scm.org/ which you can also host yourself on a $5/mo server on Hertzner or the like.

I trust more a megacorp to survive more than 5 years than a personal host, I can't tell you how many times I've gone to a personal server where something I used was hosted and its dead.