A first of its' kind, PokéFind was a utility for Pokémon GO players when the game first game out. PokéFind started off with map feature where community members reported where Pokémon were spawning around the world. 

PokéFind's features later expanded into Evolution Calculator, which predicted your Pokémon's CP if it were to evolve. An IV Calculator was also introduced into PokéFind. The IV Calculator would calculate any of your Pokémon's IVs.
 

PokéFind was available as a free website, iOS and Android app. PokéFind as a Pokémon GO companion app was later discontinued and transitioned into a Minecraft network that is still operational today.