Zest is a specialized scripting language developed by the Mozilla security team and is intended to be used in web orientated security tools.
It is completely free, open source and can be included in any tool whether open or closed, free or commercial.
Version 1 of Zest:
- Is aimed at creating scripts for reproducing basic security vulnerabilities
- Includes a java reference implementation
- Has been included in a proof-of-concept OWASP ZAP add-on
For more details see the wiki: https://github.com/mozilla/zest/wiki