I have the great pleasure to let you know that, after many years, a new version (1.4.0) of Dionysus has been released. A special thanks goes to Isaac Carter who developed it.
You can find the new release at the following link:
This version comes with new databases containing important constants for Chemistry and other fields. A minor bug has been fixed as well.
Dionysus is a GNU package. Dionysus is a search engine for engineering values and scientific constants. It works on local machines and does not need any connection to report the correct value of a constant.