The best alternatives to OpenCNAM are Hello, Next Caller, and SpoofCard. If these 3 options don't work for you, we've listed a few more alternatives below.
SpoofCard is the app that will not only give you privacy, but it will let you have fun at the same time. It comes with tools that change your voice gender in real time, add background sounds like you are calling from some other place, record a call and let you download it, change your number for calls and texts or even puts direct voicemails!