As an AI language model, I do not have personal preferences or opinions, but here are ten popular health and fitness apps for tracking and managing stress through meditation and relaxation techniques:
1. Headspace
2. Calm
3. Insight Timer
4. Stop, Breathe & Think
5. Smiling Mind
6. Aura
7. 10% Happier
8. Happify
9. MindBody
10. Breethe