There's really nothing else out there I've found that's like CoSy, but the learning curve is STEEP. I've only played with it over the years, never having spent the time to get too deep into it. If you want to try it, do read Bob's warning about the antivirus false warning in the zip file and also on a laptop, the screen will be off-screen: Move it using the alt-m and arrow keys on it.
There's really nothing else out there I've found that's like CoSy, but the learning curve is STEEP. I've only played with it over the years, never having spent the time to get too deep into it. If you want to try it, do read Bob's warning about the antivirus false warning in the zip file and also on a laptop, the screen will be off-screen: Move it using the alt-m and arrow keys on it.