API Management
API Management (APIM) include API Gateways (to publish and secure APIs), subscription, publishing and marketplace features (pay per use billing, etc) as well as monitoring.
Apigee: Apigee, a Google company, focuses primarily on a SaaS API Mangement model. It is known both for its appealing dashboards and, sometimes, shocking bills.
CA API Gateway: CA API Gateway is a rebadged product formerly produced by a company called Layer 7 (acquired by CA). Although it was originally sold primarily as an appliance, today it is often deployed as a self-contained virtual magine image both in cloud and on-prem scenarios. It is also increasingly offered on a SaaS basis.
Swagger: Smartbear Swagger is an end-to-end solution for documenting, defining schemas, and testing APIs. It is based on ideas such as contract-first APIs and the publishing of rich, intuitive API service definitions to make developer on-boarding easier.
Mulesoft: Mulesoft started off as traditional ESB vendor. Its current product suite offers APIM capabilities but they are typically used in the context of a larger and richer, ESB-esque Mulesoft stack rather than as standalone, lightweight API-centric component. It is ofen considered a more thicker and less encapsulated solution than the competition given its Java-style platform pedigree.
IBM DataPower: Although IBM DataPower is often referred as the product that created the API Gateway market, and it is still being updated, it is often considered today a rather legacy product from a bygone SOAP era. It is offered both as an physical appliance and as a virtual machine image.