Halloween: The New Nightmare
Halloween: The New Nightmare (PC, 2004) has an open-source reimplementation, ford442/Halloween3D, and 1 other public project, including an official source code release.
Data checked 2026-10-12 · unbaked registry
Projects
Halloween 3D Shooter OpenSource
development active; status playable
Wikipedia: open engine AND open game data; source released 2021 by/for Jadeware. Commercial indie game first released online and by mail order. Released on to GitHub in 2021. [Some linked GitHub URLs 404 as of Oct 2026:
What you need
Free game data is included with at least one project.
More on PC
Found via osgameclones.com/, en.wikipedia.org/wiki/List_of_commercial_video_g, brizzly/Halloween3D
GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.