Need advice on Stacking Software

Thought you all might get a kick out of this.

While learning to use my camera last night, I caught two shooting stars:

So I took some shots this evening with the FD 80mm - 210mm lens that I modified to not only fit on my Canon Rebel, but also so it would focus to infinity.

Wind was blowing quite a bit out there tonight, but here are some of the shots. They are cropped to fit here on ATS. No stacking or anything else done to them:

Orion's Nebula, finally seeing some pink here. This was 10 second exposure at 6400 ISO, F stop at 3.8:



I moved the camera up to Alnitak, the eastern most star in Orion's belt and wanted to see if I could capture some light from the Flame Nebula, and I'll be darned! I actually captured it faintly! Exposure time 20 seconds at ISO 6400:



And last, I was goofing around seeing if I could remember where the Rosetta Nebula was (it's there, but I bumped the camera), and ended up catching a meteor: