Apps for Gamers? (Not Games)

For some reason it took me a decade to enter the new millenium. Finally got a smart phone, obsessively customizing it. Not looking for games, but for apps that help gamers? Walkthroughs? Emulators? Etc.

So far my best contribution is Pluto TV, which is a TV app - curated internet content set up into a cable-like format. There are a good block of gaming channels, including 3 that are 24/7 dedicated to Minecraft, GTA, and Call of Duty.and a channel dedicated to FPS.

i think theyre called companion apps: http://android.appstorm.net/roundups/games-roundups/30-companion-apps-for-gamers/

i like the cats channel.