Note: this post is kept for historical reasons. As of 2019 the only Kit that I’m aware of is an electric machine at OpenPPG.com.
As of 2010, if you were looking for Kit Paramotors, there were two that I’m familiar with. Neither of them is still around. They were from ParamotorKits.com and Francesco DeSantis’s I-Flyer. I never flew the ParamotorKits frame but it appeared well built and I have flown their trike which worked as advertised. Plus, I’ve flown the Free Spirit which is based on the ParamotorKits frame and built by the same company.
I’ve flown the I-Flyer and it was just like the Miniplane it is modeled after.