Web
- radiance-cascades.com — interactive 2D playground with bilinear-fix, parallax-fix toggles
- SimonDev demo — open-source JS, accompanies the video
- LegitScript basic RC — in LegitScriptEditor
- futureengine2 gist — good discussion on making RC agnostic to raytracing method
Native
- tlegoc/RadianceCascadesGIVulkan — Vulkan 2D compute shaders (blog post)
- Hybrid46/RadianceCascade2DGlobalIllumination — C# / Raylib, OpenGL 3.3+
- entropylost/amitabha — HRC reference (Rust/CUDA)
- Yaazarai/Volumetric-HRC
- Otavio Peixoto’s OpenGL (guide)