How do I create front-end registration for new user sites in WP Multisite?

Is there a good plugin out there (hopefully a freebie) that will allow me to have users register in a multisite environment for their own site, through a front-end form? Probably a no-brainer question, but I'm running into problems. I was planning on using Profile Builder, but it conflicts with "Set Password on Wordpress Multisite Blog Creation" plugin...