Here is a list of astronomy projects using Linux in whole or in part of their instrumentation: [Open Source Redis] [Linux Questions]
The CHARA Array is an optical interferometer project using Linux in their control system. .:: www.geocities.ws ::. .:: speakerdeck.com ::. .:: telegra.ph ::. .:: www.driedsquidathome.com ::. .:: telegra.ph ::.
CAOS Club of Amateurs in Optical Spectroscopy.