Top 5 content-negotiation open source projects

.NET Core Custom Formatter for Yaml

Basic functions for handling mime-types, forked from Joe Gregorio's mimeparse library

PSR-15 middleware to assist primarily with language-based content negotiation and various other localization tasks

Slim 3 API Skeleton with content negotiation, authentication, error handling, cache and performance in mind.

PSR-15 middleware to implement content negotiation