I've been using QBrew for more than a year now. Overall I've been very happy with it. But now I'm venturing towards some recipes that don't supply grain bills by the pound. Instead, it's all expressed in terms of percentages. Is there a brewing program, preferably free 'cause I'm a cheap bastard, that allows you to develop recipes by punching in percentages? ProMash is ok, but it isn't free, and IMO it over-complicates things. I was looking for something with a simpler interface.
A friend also sent me this article containing a bunch of open-source brewing software links. I haven't looked through all of these yet, so maybe my best option is in this article somewhere.
http://sourceforge.net/blog/whats-brewing-in-open-source/