Yes, there are many free and open-source static application security testing (SAST) tools available. Some of the popular ones are:

SonarQube - a popular open-source platform for continuous code quality inspection.

FindBugs - a Java-based open-source static analysis tool for finding bugs in Java code.

PMD - an open-source Java source code analyzer that finds potential problems like unused variables, empty catch blocks, and dead code.

ESLint - a popular open-source tool for identifying and reporting on patterns found in ECMAScript/JavaScript code.

Bandit - a Python-based open-source SAST tool that scans for common security issues in Python code.

Brakeman - an open-source static analysis tool for Ruby on Rails applications that checks for common security vulnerabilities.

OWASP Dependency-Check - an open-source tool that identifies known vulnerabilities in project dependencies.

These are just a few examples of the many free SAST tools available. The choice of tool depends on the programming language, the specific needs of the project, and the level of expertise of the user.
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