


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.



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.