List comprehensions in Common Lisp
List comprehensions are a programming language construct that closely mimics the way you declare a set in mathematics and sometimes are more succinct and readable than using a composition of mapcar, delete-if or an ad hoc imperative loop.
Having list comprehensions in Lisp was something I was missing from Python and Haskell. So I tried to find something similar and discovered that
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cl-buchberger is out!
I’ve just released the first version of cl-buchberger, a Common Lisp
implementation of Buchberger’s algorithm for the computation of
Gröbner bases.
There are many improvements waiting in the pipeline but the basic
functionality is there.

You can read more about cl-buchberger here.