What Free Apps and Tools do you use? (New to Drones)

Hey everyone!Which apps and tools have you professional drone pilots had the most success with for airspace compliance and logging hours? I am a private helicopter pilot who recently got 107 certified and I am looking for reliability and accuracy.I have downloaded and played with a few apps so far. I just want to make sure I am starting with my best foot forward.​Thanks! via /r/drones http://bit.ly/2ZIKE71