491. cl-gtk2
     CL-GTK2 is a Common Lisp GUI library that provides access to the Gtk+ cross-platform GUI library in idiomatic Lisp style
492. cl-gtk4
     GTK4/Libadwaita/WebKit2 bindings for Common Lisp
493. cl-gui
     Browser-based Common Lisp Gui Library GUI
494. cl-hash-util
     cl-hash-util is a very basic library for dealing with CL's hash tables
495. cl-heap
     CL-HEAP implements the binary heap, Fibonacci heap, and priority queue data structures
496. cl-heredoc
     cl-heredoc is an implementation of "here documents" that allow the user to
497. cl-hooks
     cl-hooks allows the description of extension points in software using a concept of hooks (borrowed from Emacs)
498. cl-horde3d
     CL-HORDE3D provides CFFI bindings to the Horde3D graphics engine
499. CL-HRAC
     RabbitMQ Management HTTP API in Common Lisp
500. CL-HTML-DIFF
     CL-HTML-DIFF is a library for generating a human-readable diff of two HTML documents, using HTML

CLiki the common lisp wiki