The software that I use for processing and assembling timelapses now (on macOS):
Darktable is FOSS (GPL/CreativeCommons). Very powerful and quite awesome software, with somewhat clumsy user interface that doesn’t look like native app and takes a bit of getting used to, but is quite functional once you get used to it.
Darktable does the mass-edting of RAW files – all kinds of adjustments and color manipulations, cropping/rotation/resizing and export to JPEG.
Interval is a handy software for assembling bunch of JPEG images into a video file.
UPD: Interval seems to have disappeared from Mac AppStore. But one can use Time Lapse Assembler instead.