promptfoo/promptfoo (github)
Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative configs with command line and CI/CD integration.  Used by OpenAI and Anthropic.
Trust score: 8.27/10 (tier: verified)
Stars: 24287, Forks: 2194
License: MIT