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Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
WSO2 API Manager - WSO2 API Manager is a 100% open source enterprise-class solution that supports API publishing, lifecycle management, application development, access control, rate limiting and analytics in one cleanly integrated system.
dAPI - Node.js/JavaScript Dojo API viewer and static API viewer document generator.
Apigee - Intelligent and complete API platform
Apidog - All-in-One workspace for API Design, Documentation, Debug, Mock, Test
Tyk - Tyk is an open-source API gateway and API management platform.