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Martin,
depends on the camera and final requirements.
For Planetary/ Lunar/ Solar the camera used is usually a fast frame camera and Registax (5 or 6), Autostakkert (2 or 3), ImPPG will do good stacking.
Suggest SharpCap or FireCapture for camera control.
For other stuff your camera control/ acquisition software should have stacking capabilities. I use AstroArt to control all my cameras and pre-process/ process the results.
Just my 2c
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