This is a modpack that consists of all the mods (that I know of currently) and APIs needed to play along with season 4 of Ya Dead, Ya Dead.
Dynamic Surroundings - OreCruncher - Alters visual and audio surrounding. Highly customizable.
Dynamic Trees - ferreusveritas - Makes trees behave more naturally.
Exotic Birds - ThePavoReality - Adds a ton of birds to the game.
Hwyla - TehNut - A cosmetic mod. Customizable.
JourneyMap - techbrew - Real-time map in game or in a web browser.
OreLib - OreCruncher
Pam's HarvestCraft - pamharvestcraft - Adds to Minecraft's food system.
U Team Core - HyCraftHD - Child mod for Useful Backpacks
Useful Backpacks - HyCraftHD - Adds backpacks for extra space.
Wawla - What Are We Looking At - DarkhaxDev - Adds infor to the HUD.
Weather, Storms & Tornadoes - Corosus - Adds rain and storms that can evolve into deadly tornadoes.
CoroUtil - Corosus - Child mod.
Just Enough Items (JEI) - mezz - Changes the UI for crafting and recipes.