Today I learned that the Amsterdam Compiler Kit claims to support the BBC Micro's 6502 CPU as a target. I have two questions. First, if anybody has used it with 6502, is the quality of its generated code any good? Second, this appears to be the same as the Vrije Universiteit Compiler Kit (VUCK) whose non-free license prompted the development of GCC, but I'm not sure whether I'm right. (The ACK was originally non-free but became free software in 2004.)