Another option: * Sell commercial versions of your software, appliances to run it, hardware interface cards, phones, and cloud services (Digium). Pro: you can

Another option: * Sell commercial versions of your software, appliances to run it, hardware interface cards, phones, and cloud services (Digium). Pro: you can fund the OSS project from the sales and continue to innovate. Cons: you have to engineer and support the hardware, and you're running a datacenter and doing DevOps.