This add-on prevent the selection of certain types of objects in the 3D viewport. It exists in maya and it's especially useful when working on heavy scenes. i.e : when you are posing a character, for instance and you don't want to accidentally grab a light or a mesh.
Selection-Restrictor (Alesis) and Selectivity (Nikos) have merged into a single project. Luciano joined the team.
Download and manual : https://github.com/Nikos-Prinios/Selection-Restrictor
Alesis : email@example.com
Nikos : firstname.lastname@example.org - @Nikos Priniotakis (Nikos_prinio)
Luciano : @loochmunz