Left 4 Mine Mod 1.12.2 adds some mobs from Left 4 Dead game to Minecraft.
For 1.7.10
http://dl.niceminecraft.net/download.php?file=a10640a03ca83ebf027aaab55bfc6b60
For 1.8
http://dl.niceminecraft.net/download.php?file=4242174b49ff06378974a5babffb2cc3
Credits: jgj2