Then I guess my web site is your first stop. :-) For some reason my Sourceforge site always shows up first on Google searches
is a better one to go to in my opinion.
I'm just getting started with Insteon and I've written an interface to use it with Mr. House
Mr. House has a pretty steep learning curve but is extremely powerful. There is other software but I don't know what level of expertise you have and in what direct you want to go in.
BTW, others are working on more Insteon code and I know of at least one person who is working on UPB code for Mr. House.