Parachute is a simple-to-use and extensible testing framework. In Parachute, things are organised as a bunch of named tests within a package. Each test can contain a bunch of test forms that make up its body.

Confidence is a test framework for Common Lisp that focuses on simplicity. It avoids bureaucracy and makes it easy to work interactively, without a complicated setup, and with explicit functions and decisions.

This is a unit-testing framework for Common Lisp.

This package provides a Common Lisp collection of assertions.

Common Lisp port of the QuickCheck unit test framework

This package provides a Common Lisp test runner system SIMPLET.

cl-hamcrest is an implementation of the Hamcrest idea in Common Lisp. It simplifies unit tests and makes them more readable. Hamcrest uses the idea of pattern-matching, to construct matchers from different pieces and to apply them to the data.

This small library provides a way to replace the actual implementation of either regular or generic functions with mocks.

RT provides a framework for writing regression test suites.

The XLUnit package is a toolkit for building test suites. It is based on the XPTest package by Craig Brozensky and the JUnit package by Kent Beck.

This package provides a Common Lisp testing framework system CACAU which was built to be independent of assertions systems.

RE is a small, portable, lightweight, and quick, regular expression library for Common Lisp. It is a non-recursive, backtracing VM.

This package provides a Common Lisp wrapper system for the SDL 2.0 C Library.

Trucler defines a CLOS-based protocol to be used by Common Lisp compilers for environment query and update. In addition, library authors can use the trucler-native interface to inspect native environments. Trucler supports introspection for variables, functions, tags, blocks and optimization policies.

This is a Common Lisp library to read and write disk-based file archives such as those generated by the tar and cpio programs on Unix.

YASON is a Common Lisp library for encoding and decoding data in the JSON interchange format.

F2cl is a Common Lisp library that can convert Fortran 77 code into Common Lisp code.

One of the many things that didn't quite get into the Common Lisp standard was how to get a Lisp to output its call stack when something has gone wrong. As such, each Lisp has developed its own notion of what to display, how to display it, and what sort of arguments can be used to customize it. trivial-backtrace is a simple solution to generating a backtrace portably.

This package is a simple date and time library.

This package provides a simple yet powerful value inheritance scheme.

CL-ALGEBRAIC-DATA-TYPE, or ADT, is a library for defining algebraic data types in a similar spirit to Haskell or Standard ML, as well as for operating on them.

OpenAPI client system generator.

This library strives to provide a portable TCP/IP and UDP/IP socket interface for as many Common Lisp implementations as possible, while keeping the abstraction and portability layer as thin as possible.

Calispel is a Common Lisp library for thread-safe message-passing channels, in the style of the occam programming language, also known as communicating sequential processes (CSP). See https://en.wikipedia.org/wiki/Communicating_sequential_processes.

Calispel channels let one thread communicate with another, facilitating unidirectional communication of any Lisp object. Channels may be unbuffered, where a sender waits for a receiver (or vice versa) before either operation can continue, or channels may be buffered with flexible policy options.

Because sending and receiving on a channel may block, either operation can time out after a specified amount of time.

A syntax for alternation is provided (like ALT in occam, or Unix select()): given a sequence of operations, any or all of which may block, alternation selects the first operation that doesn't block and executes associated code. Alternation can also time out, executing an "otherwise" clause if no operation becomes available within a set amount of time.

Calispel is a message-passing library, and as such leaves the role of threading abstractions and utilities left to be filled by complementary libraries such as Bordeaux-Threads and Eager Future.