The current version of Therion is 6.1.8, released on June 14, 2023.

Source code – compiles on Linux, Windows and MacOS X; for instructions check the Appendix of the Therion book or the reference compilation setup used by GitHub Actions

Windows installer [46 MB] – installs everything necessary to run Therion.

Development files: the source code is hosted on GitHub. Windows installers for recent commits are available on GitHub Actions (master and devel — click on a commit name you are interested in; the link to the installer is located in the section ‘Artifacts’; you need to be logged in to GitHub to download it).

Therion packages for other platforms: Debian GNU/Linux, Arch Linux, Ubuntu, Fedora.


Therion – Digital Cave Maps: an article presented at the 4th European Speleological Congress
The Therion Book: the reference manual (included also in the installation packages)
See also the wiki pages and the list of recent changes.

Sample data

Find out how Therion works on example data. It takes only a few minutes to install Therion, run the example and get maps and model of the cave.

Padavka Chamber – somewhat complicated real-cave example [tar.gz | zip]
Rabbit Cave – plan and extended elevation [tar.gz | zip]
Example cave 1 – rather simple example [tar.gz | zip]