Add-ons:
Infinite Ocean by ihategravel
Random Fishing by MrPiedPiper
Billey's Mobs by billeyzambie
Loot Bags by iEmotionless
Ritual Magic by iEmotionless
Vanilla Mob Variants by xanion (no longer included for v4 and above)
Downloads:
(Downloads will be on MCPEDL because I will monetize this site soon and some of the stuff in the pack are not mine)