What do you suggest for free software to control a Canon or Nikon DSLR camera. Thanks. 
DSLR camera control software
Backyard EOS it’s not free but it’s only about 49.00 US works well I use it exclusively. They have a version for Nikon as well.
CS
Chris
CS
Chris
What do mean by control? I use simple Neewer invervalometer, 15€.
Astrophotography works with Canon, Nikon and CCD cameras. There is a free unlimited version! 
Joe:
Astrophotography works with Canon, Nikon and CCD cameras. There is a free unlimited version!
You mean "Astrophotography tool"? I recommand it too, cheap, very complete and easy to handle with. I use it to control my DSLR and the dizzering (through PHD Guiding). The free version maybe sufficient to begin.
APT (Astro Photography Tool) provides a free demo which is truly useful (i.e. no time limit and has almost all features). It does not require any registration. I have used it to control my DSLR and AF lenses. It does everything I need. Now I use the app which came with my SA mini and focus manually with a Bahtinov mask. As far as I know, BackyartEOS/Nikon requires registration 
to download the trial version.
to download the trial version. Helpful
Yes, APT is a great tool. Will give you everything you need, and probably more. It is really worth a trial.
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