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Re:Crystal: Fast as C, Slick as Ruby by _raul on Thursday August 04, 2016 @04:40AM (#12224256)
This may be the closest alternative right now: https://github.com/ysbaddaden/frost
Re:Crystal: Fast as C, Slick as Ruby by fuzzythinker on Thursday August 04, 2016 @02:51PM (#12227633)
Kemal is the most actively developed. https://github.com/sdogruyol/kemal