Parts of the Regen stack are available to the community as free open source software to facilitate creation of other Computer Aided Design and Graphics applications.
ADHOC
Another Declarative Hierarchical Object-Centric CLOS Customization
This is the enhancement to the Common Lisp Object System which creates generative and interactively configurable instances for Regen. It is the basis for Engineer-To-Order functionality of Regen.
Runs on PCL-based CLOS implementations.
License: AGPL
KRMA
A graphical abstraction layer implemented in Common Lisp
Based in Vulkan, KRMA provides a simplified means of presenting and animating immediate mode or retained mode 2D and 3D graphics and text for desktop applications.
Runs on Windows, Linux (x11), and MacOS.
License: BSD
CLUI
A GLFW or SDL-like compatibility layer for creating operating system level windows, input and system events, written entirely in Common Lisp, compatible with CLIM.
Runs on Windows, Linux (x11), and MacOS.
License: ZLIB
CLIMish
A CLIM inspired graphical user interface library
Layered on ADHOC, KRMA, CLUI and Hemlock, implements custom windows, forms and widgets.
License: GPL