Hi! I've researched some about the program and I think it's wort to use it. But I've not found something about the code, isn't it open source? If not do it have a special reason to not be open source?
No VarAC is not open source at the moment. It might become one someday.
It's is Free though and we have all intentions to keep it free for the sake of the ham-radio community.
If you have any suggestions or feature requests, we are very open to this. Actually about 70% of the features we develop originate from feature requests people submit HERE.
Feel free to drop any idea you have in mind.
Because the developer chooses not to. What's the problem?