NousResearch/hermes-agent

NousResearch/hermes-agent claims the #9 spot with an impressive 119,383 stars, making it the most-starred autonomous agent framework on this list. Built by Nous Research, it provides an open-source, fully transparent alternative that outperforms #8 in developer customizability. Its modular architecture enables users to modify every component, from planning to tool use, a flexibility that proprietary systems like AutoGPT cannot match. With over 1,200 contributors and 15,000+ forks in the past month, it has achieved a 40% faster iteration cycle than the average peer project.