Below is a list of some PHP Microframeworks

• Epiphany
• Flight
• Fat Free
• Silex
• Slim
• BulletPHP
• Limonade
• Phalcon
• Recess PHP
• Tonic
• Wave Framework
• Zaphpa

Though all have their own merits and demerits but Phalcon is the most recommended one for speed and Slim and Flight for ease and speedy learning. In general Slim seems to be the most preferred one and has quite some handy features.