The Slim Framework project has officially announced the release of the next major version of their popular microframework: Slim 3.0.0.:

We are delighted to release the first stable version of Slim 3, 3.0.0 following a series of release candidates. [...] Slim 3 is a major update with all parts of the framework updated.

New features in this major version release include:

• the change to a container-interop compatible dependency injection system
• complete PSR-7 support
• an update to internal classes to code against interfaces rather than concrete classes
• route callback binding to $this (the Container instance)

They've also gotten rid of some of the "cruft" that had built up over previous versions and slimmed down (pardon the pun) the codebase making it even simpler and more component driven. They've posted installation instructions to help you get started and a simple skeleton application you can drop in and be up and running quickly.