Quick fix for 3dt version 0.3.0 on Unix-like systems (that includes Linux and Mac OS X):

Due to an oversight, the shell script that is meant to run 3dt on Unix-like systems ended up with DOS-style line-endings and can for that reason not be executed correctly. To fix this, the superfluous carriage return characters have to be removed as follows (after installing 3dt successfully, see below):
  1. Open a terminal window.
  2. Enter the command 
        cd [3dt-path]
    where [3dt-path] is where you installed 3dt.
  3. Now enter the following lines in order: 
        cd bin
    mv 3dt 3dt-original
    tr -d '\r' <3dt-original >3dt
    chmod +x 3dt
You should now be able to execute 3dt normally. On most Linux system, the installer should have produced an icon on your desktop. If that doesn't work or if you're on Mac OS, you can either call 3dt from the command line by typing 
    [3dt-path]/3dt
or try to double-click on that file (after possibly copying to your desktop). Incidentally, the shell script that executes Systre in batch mode has the same problem when installed from this version and can be fixed in

Potential problem running the installer:

If your system does not allow you to execute JAR files by double-clicking them, open a terminal window, move to the directory the file is in (usually your desktop) and enter something like 
    java -jar GavrogInstaller-0.3.0alpha.jar
That should do the trick. Remember that in any case you need to have Java Version 1.5 (a.k.a. 5.0) or later properly installed.