Cygwin is great for processing data and generally have a lot of tools one might be used to from Linux. But when targeting Windows, that is, creating a program FOR Windows, maybe for general distribution, cygwin feels very cumbersome to me. PicoLisp is MIT licensed and small, so could be an integral part of a Windows program. PicoLisp has promise on Windows, but someone would have to step up and maintain a Windows package for it. I have been daydreaming about it but I have too many half-finished projects under my belt to fool myself into starting that too.