MicroMVC is a module-based MVC that is currently in active development. Featuring a full ORM, database library, migrations, administration scaffolding, and many other small and easy to understand PHP libraries.
Nginx 0.7.27+ (Or Apache with modrewrite)
PDO if using the Database
HTTP routing, Named routes, Route passing, Route redirects, Route halting, Middleware & Hooks, Custom views, HTTP caching, Signed cookies, Custom 404 page, Custom 500 page, Error handling, Logging
PHP >= 5.2
libmcrypt > 2.4.x (if using encrypted cookies)
Routes, Views & Templates, Hooks & Filters, Helpers, Halting and error handling
PHP >= 5.1.6
Silex is a PHP microframework for PHP 5.3. It is built on the shoulders of Symfony2 and Pimple and also inspired by sinatra.
PHP >= 5.3
Glue is a PHP micro-framework. It provides one simple service: to maps URLs to Classes. Everything else is up to you. The database, ORM, template engine and all other components are under your control. Glue just glues everything together. In MVC terms, Glue is the URL Routing and Controller portion while you have total control over your choice of a Model and View layer.
Flight is a fast, simple, extensible framework for PHP. Flight enables you to quickly and easily build RESTful web applications.
PHP >= 5.3