You can get an overview of Jupiter by reading the accompanying doc file
Here, you can look at a list of differences between the simple combination of Gryphon and Nemesis and the new features in Jupiter.
Follow this link to look at Jupiter OOO (Order Of Operations).
Jupiter is now offered as a shareware version. Click to download a copy and try it out for the first 20 turns of the game. Please follow the instructions in the doc file to register or Register online.
You can send me e-mail at: stardestroyer@geocities.com
Please follow this link to the Nemesis page and this link to the Gryphon page.