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http-server
An advanced async HTTP server library for PHP, perfect for real-time apps and APIs with high concurrency demands. (by amphp)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The Symfony CLI server supports SSL. Your project directory doesn't have to be a Symfony project, it will still work. https://symfony.com/download
If you don't mind using external libraries, you can use something like amphp/http-server or similar, generally all async frameworks will have some http server implementation.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.