What are some alternatives?
When comparing iStopMotion and webcam.io, you can also consider the following products
LRTimelapse - LRTimelapse 5 - the best solution for time lapse editing, keyframing, grading and rendering. Supports Windows, Mac, JPG and RAW from any Camera.
Panolapse - Add camera motion to your timelapse videos, deflicker, and combine JPG images into a video file.
Time-Lapse Tool - Time-Lapse Tool allows to make a time-lapse video in just few clicks.
MakeAVI - This is a quick and dirty app that I wrote because I wanted to do some work with creating...
FrameByFrame - Stop motion for mac.
GBDeflicker - Remove video flicker in time-lapse: Adobe Plugin or Windows Application