series

snakes

Python-like generators for Common Lisp

gtwiwtg

A lazy sequences library. Similar to 'series' but not as complete. However it has a 'modern' API with stuff like take, filter, for, fold, etc. that is easy to use

for

A concise, lispy and extensible iteration macro. It is extensible and sensible, and unlike iterate it does not require code-walking and is easier to extend. zlib

iterate

An iteration construct for Common Lisp which is extensible and Lispier. MIT