Blue Spire is a web dev consulting firm that developed a series of Javascript frameworks - Durandal and Aurelia. Durandal, Inc. is an organization that acted as the maintainer of those frameworks. Enterprise support for Durandal frameworks is provided by Blue Spire.

It was perceived that this was an arrangement that is confusing and counterintuitive, so at least as far as Aurelia is concerned, Durandal is being removed from the picture.