Pokecrew - Crowdsourced Pokemon Go map
Poke Radar - Discover the location of any Pokemon
PokeHunter - PokeHunter is a live scanner to help you find the pokemon you want, not just pidgeys and rattatas.
PokeHuntr - PokeHuntr is a website that helps find and identify Pokemon while playing Pokemon Go.
TypeDex - A comprehensive Pokémon type calculator and Pokédex
PokéVision - Find all Pokemon near you in real time for Pokemon Go.