Drogon is a C++14/17/20 HTTP application framework built on non-blocking
I/O and an event loop + thread pool model. It's one of the fastest C++
web frameworks on the TechEmpower benchmarks, and includes routing,
filters, Jinja2-like view templates, an ORM (PostgreSQL/MySQL/SQLite3),
a Redis client, WebSocket support, and HTTP/1.x + HTTP/2.

License: MIT.