Making your own comix

I have been looking for a good comic making software thats free to download. 

There are a couple on-line like this one that offers a number of different options and characters:

http://www.makebeliefscomix.com/
http://bitstrips.com/
http://www.toondoo.com/
http://www.stripcreator.com/
http://superherosquad.marvel.com/create_your_own_comic
but I am still  looking for a good one to download.  It started with my White Wonderland story that I decided to turn into a comic strip and I am doing it in Powerpoint but think there must be a better way....

Here are some hints on making your own comic strip: 
http://www.how-to-draw-funny-cartoons.com/make-your-own-comic-strip.html
http://chris.pirillo.com/how-to-create-your-own-comic-strip/

Make your own comics  http://www.pixton.com/uk/