Galactic is a Traveller star map generator and display program. It was originally written for DOS using QuickBasic and displays on a VGA screen in 16 glorious colors. Jim Vassilakos has released the Galactic into the public domain.
Despite it's obvious techological backwardness and age, it remains a well-used and almost essential piece of Traveller software becuause if it's usefulness. It is simple to use, runs on many computers (in a Windows DOS box, or under DOSEMU for linux). All of the program data is kept in human readable text files. The formats used for the UWP data remains a standard in the Traveller star mapping community.
From the online writeup:
Allows user to randomly generate sectors, displays the maps in VGA, translates the UWP code to English, and keeps campaign notes in text files which can be accessed directly from the map. The maps all mesh seemlessly. Lots of official & non-official Traveller sectors are included. There's even world mapping and star system mapping software. Contains enough online help that it can be used by someone who has never before played Traveller and is just getting into it.
Galactic 2.3c - Download from Traveller RPG Free Library
Galactic - Yahoo discussion group about galactic, with latest news and updates