Pokecrew - Crowdsourced Pokemon Go map
PokeHuntr - PokeHuntr is a website that helps find and identify Pokemon while playing Pokemon Go.
Poke Radar - Discover the location of any Pokemon
PokemonGo-Map - PokemonGo Map is a web-based tool that helps you quickly locate all the nearby Pokemon on the map.
Pokemon Go Tools - Pokemon Go tools & reference charts
PokeHunter - PokeHunter is a live scanner to help you find the pokemon you want, not just pidgeys and rattatas.