API Management 

Articles: 11 API Management Services 

See also: Application Programming Interfaces (APIs) | API Management | API Stores

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Mashery .. API Management, Infrastructure, Strategy and Developer Outreach (@mashery) {topsy} {quora}

Apigee .. "leading provider of API management and infrastructure tools, products, and technology platforms" (@apigee) {topsy} {quora}

3scale .. The Plug & Play Cloud API Management Platform (@3scale) {topsy} {quora}

WebServius .. create, manage and monetize web APIs .. (@webservius) {topsy} {quora}