Therion AlternativesMap Services and other similar apps like Therion
Therion is described as 'Complete package which processes survey data and generates maps or 3D models of caves. It runs on wide variety of platforms: Linux, Windows, Mac OS X. It is completely free, released under the terms of GNU GPL, with source code available' and is a Map service in the travel & location category. There are 2 alternatives to Therion for Linux, Flathub, Debian and Flatpak. The best Therion alternative is Mapiah, which is both free and Open Source.
Alternatives list
XTherion is an application that serves as a graphical front end for Therion. Therion itself works entirely with text-based files, but much of the data needs to be generated graphically, so XTherion is one example of how it might be done. It is written in Tcl/Tk.






