Project Summary
Frotz is an interpreter for Infocom games and other Z-machine games. It complies with standard 1.0 of Graham Nelson's specification. It was written by Stefan Jokisch in 1995-1997. It was ported to Unix by Galen Hazelwood. Currently the Unix port is being developed and maintained by David Griffith. The Unix port is also the canonical core version upon which all other ports are based.
Compiles and runs without changes on most common flavors of Unix, both open source and not. This includes MacOS X.
Portable to many other operating systems and hardware.
Plays all Z-code games including V6.
Old-style sound support through OSS driver.
In a Nutshell, frotz...
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has a well established, mature codebase
maintained by a small development team
with decreasing Y-O-Y commits -
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took an estimated 7 years of effort (COCOMO model)
starting with its first commit in October, 1997
ending with its most recent commit 7 months ago
Quick Reference
GNU General Public License v2.0 or later
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These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryJul 29 2026 — Aug 28 2026
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12 Month SummaryAug 28 2025 — Aug 28 2026
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