Oat++

Oat++ has zero dependencies and it's easily portable with a wide range of supported platforms. With Oat++ Simple-API it's easy and fun to build flexible and robust APIs. With Oat++ Async-API you can handle over 5 Million concurrent connections on a single server. Oat++ ORM provides an easy and unified way to access databases. Oat++ relies on Object-Mapping throughout its codebase to ensure consistency of APIs and data models. Automatically document endpoints with Swagger-UI and OpenAPI 3.0.0. Oat++ is used for many different purposes, from building REST APIs that run on embedded devices to building microservices and highly-loaded cloud applications. Theoretically, Oat++ can be easily ported everywhere where you have threads and network stack. With an additional comparably small effort, it can be ported almost everywhere depending on how much you strip it and what would be the final binary size.