i3 by mt-mods
A next-generation inventory
Buszmo's QoL improvement gallery
A collection by Buszmo
Packages
WorldEdit by sfan5
In-game world editor. Use it to repair griefing, or just create awesome buildings in seconds.
Unified Inventory by RealBadAngel
Replaces the default inventory and adds a number of features, such as a crafting guide
Edit Skin by Johannes Fritz
Advanced player skin customization