Requires the library mod Collective.
This mod is part of The Vanilla Experience.
Fall Through Slime is a drag-and-drop mod which makes slime blocks no longer support your weight when standing still, and you'll slowly fall through.
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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge ecosystem.
Serilum.com contains an overview and more information on all mods available.
Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!