We attempted to create a direct abstraction that would allow Glimpse to work directly against OWIN, "Classic Asp.Net" and Asp.Net Core. This abstraction was very painful and turned out to be difficult to maintain. Additionally the experence for plugin authors was very weird, as they needed to create implementations using our abstractions instead of the abstraction that the underlying platforms natively supported. This abstraction did mean that a plugin author (and us) could in theory write an implementation once, but in reality it was never that simple.
Hence our strategy moving forward is as follows (note we are open to feedback), we will support OWIN for Core using the following -
https://docs.asp.net/en/latest/fundamentals/owin.html. We will have a version of Glimpse that works directly again Asp.Net Core and ultimately one that work for "Classic Asp.Net". From a package perspective, the difference between "Classic Asp.Net" and Asp.Net Core support will hopefully be transparent to the user, but that is further out than where we are at the moment.
In terms of progress as Nik said, things are definitely alive and kicking. We are a small team attempting to something very ambitious and need more time for the bits to land. We appreciate your patients and we should have more ready to go soon.