I have gone around bugging people for permission to steal their content and have succeeded to a larger extent.
Flans mod by Jamio Flan: http://flansmod.com/
flansmod license: http://www.flansmod.com/license
Custom NPC Mod by Noppes: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1278956-custom-npcs
Not Enough Items by Chicken_Bones: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1279956-chickenbones-mods
Custom Main Menu Mod by Lumien231: http://www.curse.com/mc-mods/minecraft/226406-custom-main-menu
Rei's minimap mod by ReiFNSK: http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1275219-jul-08-reis-minimap-v3-4_01
Bibliocraft by Joseph “Nuchaz” Sinclair http://www.bibliocraftmod.com/
Dragon's radio mod by DragonbornSR https://minecraft.curseforge.com/projects/dragons-radio-mod
"Ding" mod by ichun https://minecraft.curseforge.com/projects/ding
MCHeli by EMB4 http://forum.minecraftuser.jp/viewtopic.php?t=14837
Open Modular Turrets by Poenjabiesous https://minecraft.curseforge.com/projects/openmodularturrets
Defense Tech and mekanism by Aidancbrady http://aidancbrady.com/defensetech/ http://aidancbrady.com/mekanism/download/
Fastcraft mod by sfPlayer(?) https://mods.curse.com/mc-mods/minecraft/242677-fastcraft
Realistic pain mod by pauljoda https://minecraft.curseforge.com/projects/realistic-pain
Sound Filter Mod by Tmtravlr https://mods.curse.com/mc-mods/minecraft/222789-sound-filters
Oceancraft by thomassu http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1292144-oceancraft-mod-with-whales-sharks-lobsters-and
Malasis doors by Ordinastie https://minecraft.curseforge.com/projects/malisisdoors
Audio death by portablejim https://mods.curse.com/mc-mods/minecraft/225125-audio-death#t1:other-downloads
In regard to flans mod content packs, over the course of the last year I have successfully pestered them into giving me permission on this forum http://www.minecraft-smp.de/news.php
To see exactly who contributed to flans mod, please view the "flansmod hall of fame" that is located in the survival server.