The best replacement for silex is slim.

The best alternatives to silex are rated as following:
★★★★★  slim
★★★★  laravel
★★★★  symfony
★★★  laravel 4
★★★  kohana
★★  phalcon
★  symfony2
★  hamilton beach

Your alternative for silex is not listed? Suggest!
Speaking about silex, one probably shouldn't forget about twig.

Other search terms related to silex and their ratings are:
★★★★★ twig
★ doctrine orm
You have in mind a companion for silex and it is not yet here? Propose!



Google Trends

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silex
slim
laravel