I use this as my main texturepack now, I just love the 16x natural feel it gives!
Wilhelmines Texture Pack by Liil
Wonderful and feature complete API for detailed weather
With this mod it's possible to play in a world where the climate corresponds to the biome temperature, plus all the added features of mods using this API!
Climate API by TestificateMods
GREAT potential for immersive RPG games!
This mod can add a touch of realism to item selection and wielding, although it's maybe better suited for tools rather than any item because of their weight. I can think of many applications for it: RPGs, PVP servers, immersive singleplayer, etc...
Cycle Limit by LMD
A touch of realism to your shores
It's the perfect mod for people who like to settle near a beach or lake, with it's algaes as part of the environment too.
Algae by Just_Visiting
May the Test be with you!
The models look really nice, and the sounds are amazing. It makes for fun PVP with your friends in space!
Advanced Lightsabers by ElCeejo