Blender 2.80 (still in Beta as I write this) now shipscomes with glTF-Blender-IO pre-installed since 2.80.
This is a refactoring of the original Khronos glTF exporter, combined with @Julien's importer. Both of the original projects should be considered obsolete in favor of the newer, combined glTF-Blender-IO project.
The Blender Manual includes documentation on ways to use glTF.