Best photo stacking software

Fatback

VIP Member
I need to shoot some star trails for my photography class tonight. I don't have a remote shutter release so I can't use bulb. So I figured I will take a few hundred photos at 30sec exposures then stack them. I have no idea which software I should use though. I tried to download one called RegiStax but I couldn't get it to install right. So you guys have an suggestions or favorites I should try?
 
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