“Maybe” projects are projects that I may work in the future. The idea of most of those projects is to try different languages/frameworks/whatever, in a manner that it makes something useful or that I need. There is no guarantee that any of those projects will ever see the light of the day (or have any line of code written.)
(At some point, those projects were also called YAJP (Yet Another Julio Project) by Gerald Kazsuba.)