wger is a free, open-source, self-hosted fitness and nutrition manager that handles workouts, nutrition, and weight tracking. It includes a built-in exercise wiki, a customizable workout routine system, and a REST API for integrations, all accessible via a live system at wger.de.

Key Features

Custom Workout Routines with automatic weight progression rules
Comprehensive Tracking for diet plans, body weight, and custom measurements
Nutrition Management with a food database sourced from Open Food Facts
Progress Gallery to document and compare fitness progress
Exercise Wiki for built-in exercises with community contributions
Cross-Platform Apps (Android, iOS, F-Droid, Flathub)
Self-Hostable via Docker for full control
Multilingual Support via community translations
Powerful API for third-party integrations or automations
Multi-User Support for basic gym management

Use Cases

Individuals tracking workouts, nutrition, and progress in a personal fitness journey
Small to mid-size gyms or trainers managing clients, routines, and progress data
Integrations with external tools and dashboards through the REST API

Limitations and Considerations

Conclusion

wger provides a comprehensive, open-source solution for personal fitness tracking and gym management, with a strong API and community-driven ecosystem that supports self-hosted deployments and multilingual usage.