Poldencraft Version 1.18.2-2.8.0

Ghost blocks are blocks that seem to be air to the client, but are solid to the server. They occur when the server and client are out of sync; in many cases, this happens when a haste effect wears off and there's some network latency between both. The server tells the client the haste effect is gone, but the client doesn't know about this yet and sends block break events to the server at full speed. The server thinks the client is cheating so it doesn't break the blocks; the client doesn't know that so it thinks the blocks are air now. When the player tries moving into those blocks, the server kicks him back.

Standalone mod providing the HUD features previously included in AppleCore. This is a mostly client-side mod, but it needs to be on the server in order to display accurate saturation/exhaustion values on the client.

An intermediary api aimed to ease developing multiplatform mods.

Cloth Config API is a config screen api.

Fabric’s APIs are lightweight and modular, making porting faster and game instances leaner.

API for fabric

A Fabric mod which adds dynamic lights to the game.

This mod provides users with a NEI-like light overlay.

The main feature of a schematic mod is to display a "hologram" version of a structure, which shows you exactly how to build the structure and where to place the blocks. It also includes a (configurable) overlay to highlight missing, extra or wrongly placed blocks.
Litematica also includes a nice Material List, including a Material List HUD, to help you collect the materials needed for the build.
There is also a Schematic Verifier feature, including an overlay, which you can use to scan the entire schematic area and look for any mistakes. This can be extremely useful especially with technical/redstone builds, where tiny mistakes can break everything.
There are also several Creative-mode-only helper features, such as Fill, Replace, Delete and also a Paste mode for "pasting" schematics into the world (immediate/direct in single player, using /setblock commands in multiplayer).

Lithium is a general-purpose optimization mod for Minecraft which works to improve a number of systems (game physics, mob AI, block ticking, etc) without changing any behavior. It works on both the client and server, and can be installed on servers without requiring clients to also have the mod. With the mod installed, you can see on average a 45% improvement to server tick times, resulting in a much leaner game.

MaLiLib is a library mod containing shared code for masa's client-side mods.

It enriches the standard Minecraft menu with an interface displaying a one-dimensional array of modifications

Phosphor is a Minecraft mod which works to optimize one of game's most inefficient areas-- the lighting engine. It works on both the client and server, and can be installed on servers without requiring clients to also have the mod. With Phosphor, the amount of time the game takes to generate chunks can be halved for some dimensions, and frame stuttering experienced while traversing the world can be significantly reduced. It's a no-compromises solution for improving performance either in single-player or large multi-player servers, and changes no features or behaviors of the vanilla game.

Adds config files

Roughly Enough Items is a mod to view Items and Recipes for Minecraft 1.13 - 1.16, supporting mod loaders from Forge, Rift to Fabric.

Sodium is a free and open-source rendering engine replacement for the Minecraft client that greatly improves frame rates, reduces micro-stutter, and fixes graphical issues in Minecraft. It boasts wide compatibility with the Fabric mod ecosystem when compared to other mods and doesn't compromise on how the game looks, giving you that authentic block game feel.

WorldEdit is an easy-to-use in-game Minecraft map editor. Through a combination of commands and "brushes," you can sculpt your world or simply perform numerous terraforming tasks.

Unlike many other minimap mods, Xaero's minimap keeps the aesthetic feel and look of vanilla Minecraft which might even make you forget that it was a mod in the first place. It's also the first rotating square minimap for Minecraft but there is a toggle to make it lock north and not rotate.

Xaero's World Map mod adds a self-writing fullscreen map to your Minecraft client. Works as a separate mod but is a lot better with Xaero's Minimap. The reason why it's available separately is to keep Xaero's Minimap as light-weight as possible.