StarStaX

If you are familiar with star trail photography, then the only thing I need to tell you is that the free StarStaX image stacking and blending tool will help you create star trail images. If you are not familiar with star trail photography, then listen up. Know those cool photos where you can see the movement of the stars because they are presented as streaks across the sky? Those types of images can be created with the StarStaX application.

StarStaX is available for multiple platforms: Windows, Mac OS X, and Linux.
To get started with StarStaX on a Windows-powered PC you must go through the following steps: download an archive, extract its contents, run the StarStaX executable.

Load several images into StarStaX and a list of all these images will be presented by the panel to the left. Select an image from the list and a preview will be displayed by the main panel. Click the cog or the wrench icons in the upper right hand corner and you will be presented with the Preferences and Tools panels. Overall, the interface is easy to use, easy to navigate.

You can load several types of images into StarStaX: JPG, TIFF, TIF, BMP, PNG. StarStaX allows you to open photos and dark frames. Several blending options are offered by StarStaX: lighten, gap filling, darken, add, subtract, multiply, and more. So if you load some photos and dark frames, select the gap filling blending option, process the images, and then set the threshold and amount from the Tools menu, you will have a star trail photo that you can save to the location of your choosing.

StarStaX is free software.

Create beautiful star trail images with a bit of help from StarStaX, a free image stacking and blending tool that is available for multiple platforms.