Here are a few Apps I can suggest that either have been professionally recommended, I've used or students have shown me that help them.
Mindshift CBT - Anxiety Canada. Many features to help with worry and anxiety
Kids Help Phone Canada -Text with a counsellor
Relax Melodies: Sleep Sounds
Daylio - Diary, Journal, Mood tracker
Presently - Journaling App for reflection
My Noise - Rain, spring walks, etc.
Relaxing Noise - Various sounds to help unwind