Go hang out in the SaaS Growth Hacks group on Facebook and let people know you have a free / open source Intercom alternative. Every week people in that group are asking for cheaper alternatives, and usually they just care about the live chat portion of the product.

I feel like one of the biggest pain points of Intercom is their pricing, and you should ride that wave as much as possible (in addition to "companies that are security and privacy conscientious").