Voyager is mobile-first, but can be run as a webapp frontend that you can host locally (out of a repo or docker container), or set up for web access. If it’s just keyword filtering you’re after you can also use ublock origin rules to do that (in fact there was a lemmy thread today talking about it somewhere) You can set rules like

lemmy.ml##.post-listing:has(.post-title:has-text(/trump|elon|musk|biden|kamala|rfk/i))

and the content will simply not render.

There is one variant called Magnetized Target Fusion that kinda-sorta works like this, where the “cylinders” are made of liquid Lithium. On each “stroke” of the engine:

• A rotating chamber of liquid Lithium is spun to make a cylinder of liquid metal
• 500 pistons situated at the site of each spinning Li pool are precisely synchronized to push the liquid metal inward, turning it into a sphere
• Fusion fuel (H plasma) is injected into the middle
• The intense pressure forces the fuel to undergo fusion, pushing the pistons back out and distorting the Lithium back into a cylinder