What's a good (and cheap) time lapse program to link hundreds star pictures into a movie?

Back in October of 2019 I used a GoPro 4 Black camera to take time lapse pictures of the stars from the south rim of the Grand Canyon. See 20 second clip here

I can’t remember what time lapse program I used to like the pictures.

What time lapse program do you use?

FYI: I have an iMac OS Big Sur, Version 11.6.8
Also:
In 3 weeks I will camp inside the Grand Canyon at two locations (Cottonwood Campground & Phantom Ranch). It’s a 2½ day north rim to south rim hike.

The night sky will be moonless and hopefully cloudless with no airplanes. Hoping for something spectacular.

Thanks!