XCSoar

XCSoar is a powerful tactical glide computer for glider and paraglider pilots.
Free and open-source, with no ads and no tracking.
Runs on Android, iOS, Linux, macOS, and Windows.
Built by an active open-source community.

FEATURES

- Moving map with terrain, airspace, airports, and task navigation
- Built-in audio vario for acoustic climb/sink feedback
- Context-sensitive InfoBoxes with altitude, navigation, glide
calculations, wind, weather, and task data
- Traffic display and advanced glide computer calculations
- Task planning/declaration with support for many vario and logger devices
- Flight analysis tools such as barograph, polar view, and OLC optimization
- Thermal centering assistance and support for online thermal sources
- Import support for common waypoint, airspace, and map formats
(including CUP, CUPX, OpenAir, and XCM)

WHY XCSOAR

- No ads, no tracking, no data collection, and no account required
- Works offline; your flight data stays on your device
- Multi-platform: phone, tablet, PC, Kobo, and embedded computers
- Open-source alternative to commercial glide computers
- Supports a wide range of hardware

Documentation:
- User manual: https://xcsoar.org/discover/manual.html