- cl-growl - Growl is a notification/logging system for Mac OS X
- cl-log - cl-log is a highly configurable logging library
- cl-syslog - CL-SYSLOG provides access to the Unix syslog logging facility and UDP remote syslog capability
- hu.dwim.logger - hu,dwim,logger is a logging library
- Log4CL - Log4CL is high performance extensible logging library for Common Lisp
- log5 - Log5 is a logging library organized around five things: categories, outputs, senders, messages and contexts
- logv - Logv is a logging library for Common Lisp
Logging libraries. See also other tools for development.