autoplot.jar is an executable jar file. Change the permissions on it, and it can be
run on Windows and Macs by double-clicking on it, or on Linux/Unix by
typing in the jar file name (./autoplot.jar).
Autoplot.*.dmg is a distribution made for Macs, which has an embedded JRE (Java Runtime Environment) within.
For more information or JNLP releases, see http://autoplot.org.