InGame Info XML by Lunatrius
Display extra information on top of your ingame screen.
opensource clientside HUD
IngameInfo by bspkrs
Want to know how much score you have without having to die? In need of real time information like weather, light level or your world size as you explore? Then this mod is for you!
clientside HUD opensource
Inventory Tweaks by Jimeo Wan, Kobata
Tweaks to inventory handling for ease of use, including sorting and automatic replacement of broken tools or exhausted stacks of items.
Just Another Spawner (JAS) is a Minecraft Mod aimed at providing an alternative entity spawning system for Minecraft.
Logistics Pipes by davboecki, AartBluestoke, ArtForz, GUIpsp, theZorro266
Logistics Pipes is an extensive overhaul of the Buildcraft pipe system. It allows for better distribution of items via pipes, more organised stockkeeping and easier automated crafting.
Minecraft Forge by LexManos, Eloraam, Spacetoad
Minecraft Forge is a common open source API allowing a broad range of mods to work cooperatively together. It allows many mods to be created without them editing the main Minecraft code.
Pet Bat by AtomicStryker
PetBat mod allows you to tame a bat that will accompany you and help you fighting mobs.
mobs survival opensource