This app was mentioned in 1 comment, with an average of 3.00 upvotes
I'll start:
For scoring, I use Squash Scorer Plus by Tim Medhurst. I think this is the scoring app for Android devices. Tim's a long-time squash player, and he's really invested the time in listening to users, improving the app, and adding valuable features over time.
Before I switched to Android, I had an iPhone, and used Court Buddy for scoring. Good app, nice simple UI - not as feature-rich as Squash Scorer, but solid.
I also have the Squash Xtra app (Android link - it's also available for iOS) installed, to read current and older editions of the PSA fan magazine.