Where to find these Mine craft mods?

So I went to my cousins house last week and we decided to play minecraft. But on his computer he had two of the coolest mods I've ever seen. Mod 1) At night it doesn't spawn any enemies except zombies, but the catch is it literally spawns like 50 times the normal amount of them. I looked out the window of his two story house and it was completely surrounded by zombies! Mod 2) This mod was pretty cool because the whole map was one giant village. So if anyone knows what i talking about, please provide me with a link.