Tipsy
Tipsy is an MVW (Model, View, Whatever) PHP micro framework inspired by AngularJS. It provides a very lightweight, easy to use interface for websites, rest apis, and dependency injection.
Today Tipsy reaches v0.8.0, and brings a whole lot of stability and features including middleware which is useful for login services.
See tipsy.la for more detailed examples and documentation.
Model View Whatever
Angular called itself MVW, model view whatever, and I loved that, so I borrowed it. Tipsy was a PHP micro framework that brought Angular's ideas to the server: light, quick to set up, good for a website or a REST API, with dependency injection because by 2015 I didn't want to write PHP without it.
At the end of September 2015 it hit v0.8.0, and the big feature was middleware, so you could say "everything under here requires a login" once instead of at the top of every route. I framed that release around stability.
By then a lot was running on Tipsy: Cheryl, Squirrelly, and my own site. Within a few months it had a YAML config plugin, a hackathon starter, and an auto updater for its own dependencies. The docs lived at tipsy.la.