This is where I keep my Celestia stuff.
[ Asteroid Maker ] (version 1.6, 1087kb zip) This is the spreadsheet I use for creating realistic asteroid belts for fictional star systems. I am currently working on version 2.0, which will be a Windows-based application with improved functionality and performance.
Mirror: [ Celestia Motherlode | Asteroid Maker ].
[ Proxima Centauri ] (version 1.0, 2729kb zip)