below is some of the free software that rattles around the internet. I've run most and use some but depending on what you want to do depends on which software you need.
Another great program from http://www.stark-labs.com/index.html
It works with most of my cameras and some of the latest updates include stuff for DSLRs as well. Highly recomended by me.
another winner also from Starkies stables. For taking AVIs and excellent for planetary and lunar work.
The home of Image Source Cameras. The software is available as a free download and can be used for images and AVIs. It's great once you get to know how to run it.
Supplied with the Canon cameras. I use it quite often when imaging with the Canon 400D and 450D DSLRs. I like it for the camera controls that can be adjusted during an image session without physically touching the camera itself.
Part of the Stark labs collection of great software that I use in my observatory.
Probably recognised as the best guiding software around. I highly recomend it to anyone who is serious about long exposure imaging.
META GUIDE http://www.astrogeeks.com/Bliss/MetaGuide/
haven't tried this yet but will let you know .
Now tried it and it's also an excellent tool for collimation adjust.
very good and one of my favourites. I use it in conjunction with photoshop. It's updated regularly.
DEEP SKY STACKER
An excellent image stacking program that's also free. Updated regularly and recomended and used by many people I know.
Another excellent AVI frame stacking program that's also free. It will work with most AVIs captured by various programs. Can be used for deep sky object image lists.