1. Language Support: Apache Camel primarily uses Java for developing integration applications, while Azure App Service supports various programming languages such as .NET, Java, Node.js, Python, and PHP. Cloud Foundry also allows developers to use multiple languages like Java, Ruby, Node.js, Python, PHP, and Go for application development.
2. Deployment Flexibility: Azure App Service provides a Platform as a Service (PaaS) environment for deploying applications, while Cloud Foundry offers both PaaS and container-based deployment options. Apache Camel, on the other hand, is a lightweight integration framework that can be run on any Java Virtual Machine (JVM).
3. Service Integration: Azure App Service provides seamless integration with other Azure services like Azure SQL Database, Azure Storage, and Azure Active Directory for easy application development and deployment. Cloud Foundry, on the other hand, offers a marketplace of services that can be easily integrated into applications. Apache Camel allows integration with a wide range of protocols and technologies through its extensive set of components.
4. Scalability and Resources: Azure App Service allows automatic scaling of applications based on demand and offers various pricing plans for different resource requirements. Cloud Foundry also supports automatic scaling and provides various resource management capabilities. Apache Camel's scalability and resource handling depend on the underlying infrastructure where it is deployed.
5. Monitoring and Management: Azure App Service offers comprehensive monitoring and management tools through Azure Monitor and Azure Resource Manager. Cloud Foundry provides logging and monitoring through its components like Loggregator. Apache Camel may require additional monitoring and management tools to be integrated for complete visibility into the integration processes.
6. Vendor Lock-in and Portability: Cloud Foundry promotes multi-cloud environments and offers support for deploying applications across various cloud providers, reducing vendor lock-in. Azure App Service, while offering flexibility and scalability, ties the applications closely to the Azure platform. Apache Camel being an open-source framework, offers portability across different environments but may require additional configuration for deployment on various platforms.

In Summary, the key differences between Apache Camel, Azure App Service, and Cloud Foundry lie in language support, deployment flexibility, service integration, scalability, monitoring, and portability.