This list is missing https://github.com/nikic/FastRoute which is definitely worth looking at.
Note that is more than a router, it's a microframework.
This has come up a couple of times in PHP framework and router threads, and i've been wondering what it would look like (it would probably be even smaller than Slim Framework). I've gotten as far as including Composer and a rather barebones router and telling people to just include whatever else they want but I suspect other people would want more.
I find it annoying when frameworks include dependencies I don't want, particularly an ORM or a templating engine, but I understand for a lot of people, that's the point (not having to pick dependencies themselves.)
Edit: as in, which router do you pick and how do you pick one? Choice can lead to decision paralysis.
Although, doing it without a router is probably always going to be faster.
php_value auto_prepend_file 'before.php'
I personally would still prefer a router but I know of a project which was written almost entirely in sprawling, procedural PHP that might benefit from this. Although I do wonder what the performance hit would be.