Common Lisp editor/IDE with high expansibility

The Superior Lisp Interaction Mode for Emacs

intended to be a launcher for a major lisp environment that just works.

CLOG - The Common Lisp Omnificent GUI

A fast non-blocking HTTP server on top of libev

A fully-fledged Common Lisp game engine

Common Lisp 3D Graphics Project

CIEL Is an Extended Lisp. Scripting with batteries included.

SHell in Common Lisp

Cl-cuda is a library to use NVIDIA CUDA in Common Lisp programs.

SQL document database with full history.

Asynchronous IO library for Common Lisp.

Sento - Actor framework featuring actors and agents for easy access to state and asynchronous operations.

Free (GPL) Common Lisp data analysis library with emphasis on modularity and conceptual clarity.

A new user interface protocol and toolkit implementation

An image processing library for Common Lisp

Fast octet-vector/stream I/O for Common Lisp

C language syntax in Common Lisp

Generic function interface to standard Common Lisp functions

Common Lisp I/O library

A Common Lisp library for solving linear programming problems

Transducers: Ergonomic, efficient data processing

HTTP/2 interop library in Common Lisp

Allocate SIMPLE-ARRAYs in static memory

Implementation for Common Lisp.

A lightweight thread / cooperative multitasking library for Common Lisp.

Static generic function dispatch for Common Lisp

A convenient SIMD interface for SBCL.

Data Frames for Common Lisp

a minimal versioned log structured relational DB in Common Lisp