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Re:Writing a Lisp: Continuations by grzm on Thursday May 18, 2017 @02:45PM (#14369892)
Wikipedia provides a list of continuation implementations in a variety of languages:

https://en.wikipedia.org/wiki/Continuation#Programming_langu...

Some of these are first-class continuations; others support continuation passing style.

Re:Writing a Lisp: Continuations by nathell on Thursday May 18, 2017 @03:02PM (#14370068)
As an example, here's a simple proof-of-concept webapp I wrote in Ruby, based on continuations:

https://github.com/nathell/ruby-continuation-webapp