Minecraft Fabric is described as 'Fabric is a lightweight, experimental modding toolchain for Minecraft' and is a Modding App in the category. There are four alternatives to Minecraft Fabric for a variety of platforms, including Minecraft, Linux, Mac, Windows and BSD. The best alternative is Quilt, which is both free and Open Source. Other great apps like Minecraft Fabric are Minecraft Forge (Free, Open Source), Liteloader (Free) and Minecraft Rift (Free, Open Source).
The Quilt project is an open, community-driven modding toolchain designed primarily for Minecraft. By focusing on speed, ease of use, and modularity, Quilt aims to provide a sleek and modern modding toolchain with an open ecosystem.
LiteLoader is a lightweight mod loader for Minecraft designed to provide simple, high-performance and reliable loader functionality for mods which don't need to modify game mechanics. Represent entire series of Liteloader games.