As Paul Jones mentions in this new post to his site, the Aura Framework project has just released it's 1.0 stable version of all of its packages. The Aura project provides independent library packages for PHP 5.4+. These packages can be used alone, in concert with each other, or combined into a full-stack framework of their own.
The Aura Project for PHP 5.4 is happy to announce its first release of 1.0.0 stable library packages. [...] In addition, we have initial beta releases of four new libarary packages. [...] While the above packages are completely independent of each other, Aura also has a Framework package that binds them all together.
You can find out more about the project from its site over on github.