Mutation testing has been out there for a while now, and it seems there are at least one or two commercial mutation testing frameworks for C/C++. Have you used them? What are your experiences? Are there any open source alternatives?
A brief search resulted in:
With that said, you need to realize that mutation testing isn't particularly useful (at least from some stuff I've previously read). It's an interesting tool when faced with hard (metaphorically speaking) asserts and for making sure that data requirements are heeded to (when dealing with if and only if situations).
In my opinion, there are much more established ways of analyzing the robustness of code.