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Yes, there are a few open source ATS APIs that come highly recommended for managing resumes and job applications. Some popular options include:

• JobCaser: Jobcase offers an API that allows for seamless integration with your ATS system, providing access to a vast network of job seekers and employers.
• OpenCATS: OpenCATS is an open source Applicant Tracking System that provides a robust API for managing resumes and job applications.
• SmartRecruiters: SmartRecruiters offers an API that allows for seamless integration with your ATS system, providing access to their extensive talent acquisition platform.

Please note that it's essential to research and evaluate each ATS API option to find the one that best suits your specific needs.