Ekos
Ekos is part of the KStars project, and uses KStars' INDI capabilities.
Ekos is a tool that aims to provide astronomers using Linux with a single, consistent, and extensible framework to perform astrophotography tasks. This includes polar alignment using drift method, auto-focus & auto-guide capabilities, and capture of single or stack of images with filter wheel support. Ekos is still under heavy development and is not ready for production use. Any testing and feedback is highly welcome.
Ekos is now released with KStars for KDE 4.10. INDI's website seems to be more up-to-date than Ekos's on this point.