RaphiMC

The Imme­di­ate­ly­Fast mod sig­nif­i­cant­ly speeds up ren­der­ing in Minecraft by opti­miz­ing the dis­play of enti­ties, blocks, text, and inter­faces for improved performance.

ViaVer­sion addon that adds sup­port for notable exper­i­men­tal Minecraft versions.

A mod for Minecraft on Fab­ric that allows con­nect­ing to servers of all game ver­sions — from Clas­sic and Alpha to mod­ern releas­es, spe­cial edi­tions, and even Bedrock Edition.

Open source Minecraft authen­ti­ca­tion pro­to­col for proxy servers, pro­vid­ing secure con­nec­tion to online mode servers