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- GUIs, the holy grail for which is "write once, run everywhere". This might be possible in a suitably portable version of Scheme, even a compiled one. (Compilation could be a "cloud" service too.)
- expat XML parser (Felix wrote it, I just ported it to chicken 4, and keep using it)
Thanks to Felix for starting this great project. And thanks to everyone in the community for writing so many eggs and thereby making Chicken practical for "real work".