I am looking for a SID emulator that is open source, but not GPL. In particular, I am looking for something with a license that allows me to link it to a closed-source program; and also one that allows me to take its source code and rewrite it in a different language targeting a different platform, and then release that rewrite under an open source license. LGPL, or MIT/BSD would be examples of licenses that would work for me.
I know of the following SID emulator engines, but all of them are GPL:
Then there's also