Azure Container Instances (ACI) is another hidden gem. It offers a serverless way to run containers without the need to manage underlying infrastructure. It's ideal for running short-lived tasks and can greatly simplify deployment processes.

Another lesser-known feature is Azure Key Vault, which helps developers securely store and manage cryptographic keys, secrets, and certificates used in applications. It can be integrated with Azure services and third-party platforms to enhance security.

Azure Logic Apps is another feature that often goes unnoticed. It allows developers to build workflows and automate tasks by connecting various services and systems together, without the need for writing extensive code.

One lesser-known feature is Azure Functions Proxies, which provide a way to define a single entry point for multiple serverless functions. This can simplify API management and allow for better separation of concerns.

Azure AD B2C is a powerful identity management service, often overlooked by developers. It provides a way to handle user authentication and authorization, with support for social, local, and federated authentication methods.

Azure Cognitive Services, such as Speech-to-Text, Text-to-Speech, and Language Understanding, are often not fully explored. These services provide prebuilt AI capabilities that can be easily integrated into applications, saving development time and effort.