// Open Source Swiss Army Knife for Geocachers
A free, modern alternative to GSAK — manage your geocache database locally on Windows, Linux, or macOS.
// Features
Built by geocachers, for geocachers. OpenSAK handles the heavy lifting so you can focus on the hunt.
Import GPX files and Pocket Query ZIP archives with full Groundspeak field support including logs, attributes, and waypoints.
18 filter types with AND/OR nesting. Save and reuse filter profiles. Filter by D/T, type, size, attributes, date, distance, and more.
Colour-coded cache pins with clustering on OpenStreetMap. Corrected coordinates for mystery caches shown with an orange overlay.
Send your filtered cache selection directly to a connected Garmin device via USB — ready for offline field use.
Built-in converter, projection calculator, checksum tool, midpoint finder, and distance/bearing calculator.
Full interface in English, Danish, and French — with more languages on the way. Community translations welcome.
Manage separate databases for different regions or trip planning. Switch between them instantly.
All data stays on your own machine. No cloud, no accounts, no tracking. Your geocaching data is yours.
// Comparison
The only free, open source, cross-platform desktop geocache manager.
| Feature | OpenSAK | GSAK | iCaching | GeoGet |
|---|---|---|---|---|
| Free | ✓ Free | ✗ Paid | ✗ Paid | ✓ Free |
| Open Source | ✓ MIT | ✗ Closed | ✗ Closed | ✗ Closed |
| Linux | ✓ | ✗ | ✗ | ✗ |
| Windows | ✓ | ✓ | ✗ | ✓ |
| macOS | ✓ | ✗ | ✓ | ✗ |
| GPX / PQ Import | ✓ | ✓ | ✓ | ✓ |
| Advanced Filters | ✓ | ✓ | ✓ | ✓ |
| Garmin Export | ✓ | ✓ | ✓ | ✓ |
// Download
Pre-built packages for all platforms. No installation wizard, no license key, no nonsense.
// Open Source
MIT licensed. Every line of code is on GitHub. Contributions, bug reports, and translations are all welcome.