Cor Berrevoets writes:

Hi,

A new update of RegiStax (V2.1) is available at the website from this
moment on. I hope the new additions (for instance TIFF loading/saving)
and the changes (a more stabile program) will be welcomed.

I stumbled on RegiStax just a week or so ago, and have liked it pretty
much so far. It and Iris are my favourite tools for trying out
stacking and other astronomy-related image processing so far. Now if
the weather only be more clear...

The only major gripe so far is that I have to run it under Wine,
because no native Linux version is available. (Somewhat small set
of supported image formats was a slight pain, but addition of TIFF is
a good step to improve this. It'll remove one image format conversion
step from my process.)

BTW, it seems also to be useful for general night photography; by
stacking 19 stills from the same light-pollution illuminated
night-time lake, I got impressively low noise.