Mods are only for version 1.20.4. If it's linked here, it works on 1.20.4, even if not stated on the websites.
Vanilla Plus Server as in Mods are Server-Sided. You don't need to Mod your client to join.
Fabric Modloader (0.15.7) by FabricMC on Github
Fabric API by modmuss50 on Modrinth/Curseforge OR by FabricMC on Github
Requires Fabric Modloader
Balm by BlayTheNinth on Modrinth/Curseforge
Requires Fabric Modloader
Collective by Serilum on Modrinth/Curseforge
Requires Fabric Modloader & Fabric API
Architectury API by architectury on Modrinth / shedaniel on Curseforge
Beautified Chat [Server] by Serilum on Modrinth/Curseforge
Requires Collective
Stackables
Time Stacker
Anvil Restoration
Fabric Modloader (0.15.7) by FabricMC on Github
Fabric API by modmuss50 on Modrinth/Curseforge OR by FabricMC on Github
Requires Fabric Modloader
Cloth Config API
Mod Menu
Sodium
Indium
Lithium
Memory Leak
LambDynamicLights
FerriteCore
Just Enough Items
Shulker Box Tooltip
Inventory Sorting
Stackables
Iris Shaders
OptiGUI by opekope2 on Modrinth/Github/Curseforge
Requires Fabric Modloader
Animatica by FoundationGames on Modrinth/Github/Curseforge
Requires Fabric Modloader & Fabric API
Colourful Containers by BurntToast_ originally by Chris_XENO on Planet Minecraft
Requires OptiGUI for Fabric / Optifine for Forge
Chest Boat GUI (Light) by opekope2 on Modrinth
Requires OptiGUI for Fabric
Dark GUI by Vanilla Tweaks
No Mods Required
Colourful Containers Dark Mode GUI by BurntToast_ originally by Chris_XENO on Planet Minecraft
Requires OptiGUI for Fabric / Optifine for Forge
Chest Boat GUI (Dark) by opekope2 on Modrinth
Requires OptiGUI for Fabric