Started as a way to make sure every kid on my 1st/2nd grade team actually got the ball. A few of my friend coaches started using it so I figured it was worth sharing: https://flagballercoach.com/
The feature that started it was the gameplan builder, it lets you script plays by quarter with your full roster in context so no one gets forgotten. It has all the standard stuff...draw plays, play libraries, print, etc.
Personally, I like to draw plays and set up the gameplan on desktop, then use my phone on the sideline to call the game and track score/stats.
You do need a free account (just an email), but you can peek at the tutorials first before signing up:
https://www.youtube.com/playlist?list=PLR7Xm0lgwz-woAcc0PZCK7KjiukqdGpRd
Give it a go and let me know what you think.