QMapShack is the successor of QLandkarte GT. It is licensed under GPL3+ and is available for *nix, Windows and OS X systems.
- QMapShack project website on github.com/Maproom/qmapshack/wiki
- Forum about QMapShack (the programmer is active there; German)
- How-To: compiling and installing QMapShack on Linux Mint19 (Ubuntu Bionic) (includes a script which automatically fetches the newest development version of QMapShack; German)
Linux note: Some 'updates' are to version 10. This will fail when some libraries are updated to current versions. Dated January 2020.