We recently added support software for SEO Book members. It is powered by Kayako SupportSuite, which is perhaps a bit more than we need as a 2 person business, but I think the software is fairly powerful and looks quite professional. 
The only downsides were that it took me a while to install it and we are running out of room in the sitewide navigation at the top of the page…one more item and the formatting dies!
More: continued here
