https://bitbucket.org/cse-assemblyline/assemblyline/src
Released under the MIT license with crown copyright. Looks like a plain ol' Flask application. I don't know what I was expecting from the government. Maybe more Microsoft and more Oracle, more "enterprise". And the git history goes back ten months with an initial commit of December 21, 2016.
I'm actually surprised to learn that CSE would be in charge of such a thing. I would have thought that this fell under the role of Canadian Security Intelligence Services. We definitely don't hear a lot about CSIS or CSE in the news to the point that I think most Canadians might have a hard time expanding those acronyms or know what they mean. It's good to see a little more transparency from them and to not have to wait for NSA leaks to figure out what their Canadian counterparts are up to.