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TempleOS

TempleOS is a lightweight, biblical-themed operating system created by American programmer Terry A.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

TempleOS is a lightweight, biblical-themed operating system created by American programmer Terry A. Davis. Designed as the “Third Temple” prophesied in the Bible, it was developed largely by Davis alone over about a decade. TempleOS is a public-domain, open-source PC operating system intended for recreational programming.

History

TempleOS was created by Terry A. Davis, who began the project under earlier names including J Operating System, LoseThos, and SparrowOS. Development spanned about a decade, with the first release in 2005 and later updates through 2018.

Design

The operating system was built as a lightweight PC OS for recreational programming. It is a 64-bit, non-networked system with a single address space and ring-0-only operation, supporting limited graphical and audio capabilities. TempleOS uses the HolyC programming language, created by Davis.

Cultural and religious significance

TempleOS was intentionally designed as the “Third Temple” referenced in the Bible. Davis associated the project with religious revelation, making the system notable both as software and as an expression of his personal beliefs.

Legacy

TempleOS is widely discussed as an unusual solo development project and as an example of outsider software creation. Its unconventional design and the life of its creator have made it notable in computing history.

Key facts

  • TempleOS was created by Terry A. Davis over about a decade, with first release in 2005 and last update in 2018.
  • It is a 64-bit, non-networked operating system with single address space and uses the HolyC programming language.
  • The OS was intended as the 'Third Temple' and reflects the creator's personal religious beliefs.
  • TempleOS is distributed as public domain and open source.
  • It is recognized as an unusual solo development project and example of outsider software creation.
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Canadian context

TempleOS has no specific Canadian connection in the available sources, but it is relevant to Canadian readers as an unusual and historically notable operating system in computer history.

Frequently asked questions

What is TempleOS?
TempleOS is a lightweight, biblical-themed operating system created by Terry A. Davis for recreational programming.
Who created TempleOS?
TempleOS was created by American programmer Terry A. Davis.
When was TempleOS first released?
Sources state that TempleOS was first released in 2005.
Is TempleOS open source?
Yes. It is described as open source and distributed in the public domain.
What programming language does TempleOS use?
TempleOS uses HolyC, a language developed by Terry A. Davis.
Does TempleOS support networking?
No. Sources describe TempleOS as non-networked.

References

  1. Simple English Wikipedia — https://simple.wikipedia.org/wiki/TempleOS
    Supports: Basic description, release year, public-domain/open-source status, and feature overview.
  2. Wikipedia — https://en.wikipedia.org/wiki/TempleOS
    Supports: Alternative names, creator, religious intent, and official website reference.
  3. Wikipedia — https://en.wikipedia.org/wiki/Terry_A._Davis
    Supports: Creator identity, HolyC, and development context.
  4. Wikipedia (Polish) — https://pl.wikipedia.org/wiki/TempleOS
    Supports: 64-bit, multicore, public-domain, open-source, recreational-programming description.
  5. Wikipedia (German) — https://de.wikipedia.org/wiki/TempleOS
    Supports: Technical characteristics including ring-0-only, single-address-space, and non-networked design.