Back in the day, we had PEAR packages. These were often very well written, but due to PEARs lack of popularity we ended up just using mega-frameworks and writing bundles, modules, cells and sparks for that framework. Since then Composer has been a bit of a savior, but the way in which we make these packages is still new and scary.
There are a lot of talks about building good code, and writing OOP well, but how do you make a Composer package that is as high in quality as you can? Things like SemVer, avoiding NIH syndrome verses knowing WHEN to fork or make a new package, responsible deprecation and loads more.
The League of Extraordinary Packages is a group of developers who have banded together to build solid, well tested PHP packages using modern coding standards. The name might be a little silly, but the group dedicates itself to active maintenance, handing over projects when a lead has to step aside, working together and an absolute dedication to following and supporting standards.