What cross-platform library would you recommend for C ++?

    Good evening!
    Most recently, I faced the task of implementing a socket server to serve ~ 3000 connections simultaneously. A reasonable assumption is to write a server in C ++, but due to the lack of experience with C ++, several questions have arisen, the main of which is which cross-platform library to use when writing the application.
    The server will be running FreeBSD. The library is required to provide methods for working with Mysql and sockets.
    When combing this area, two libraries were allocated: Poco and QT.
    So, are there any developers on the C ++ hub and what libraries do you use?

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