The work is part of a U.S. government-backed project
"We applaud the developers responsible for the 11 open-source projects that have advanced to the second rung of code security and quality," said David Maxwell, open-source strategist for Coverity.
The, sponsored by the , uses Coverity's Scan, which grades projects on a "ladder" at fixing and preventing flaws.
Eleven projects have been awarded the newly announced status of Rung 2, including those known as Amanda, NTP, OpenPAM, OpenVPN, Overdose, Perl, PHP, Postfix, Python, Samba, and TCL. According to Coverity, this new development means users will be able to "select these open-source applications with even greater confidence."
Several other projects are expected to advance to Rung 2 over the next few months. The Open Source Hardening Projectand was expanded early in 2007 to cover a list of 150 projects.
Coverity uses static source-code analysis to spot errors in code, such as open brackets. Projects on Rung 2 will move on to use the company's "satisfiability" techniques, which use a bit-accurate representation of a software system, translating every relevant software operation into Boolean values (true and false) and Boolean operators (such as and, not, or).
Coverity claims this type of analysis is a first in commercial programming and is able to spot hundreds more bugs than the tools available on Rung 1.
Although the project is clearly improving the security of open-source software, some have expressed concern that coverage of its results may produce bad publicity in the form of headlines about security flaws in open-source software.
Peter Judge of ZDNet UK reported from London.