ACT predates Roland's ownership of Cakewalk by quite some time. Possibly a long time. The last time windows that look like the ACT were fashionable was the spectacularly ugly Windows 3.11.
I would imagine, unless the rights are with some third party developer like a few of the plugins, that ACT is still part of the Cakewalk assets.
It's immaterial in a way. When I said "ACT needs a rewrite" maybe that "British understatement" we on this side of the Atlantic are claimed to possess obscured my meaning.
So for the avoidance of doubt, by "rewrite" I meant ACT should be quietly taken outside and put out of its misery as fast as a replacement system can be put together and the replacement of ACT ought to be a priority.
The days of hardware controllers dedicated to specific DAW software are (with the exception of Live, which is a unique case) numbered I suspect. The future would appear to be remote control by touchscreen devices and easy integration of third party MIDI hardware controllers that can interface with anything that accepts MIDI input.
It's ridiculous that third party solutions such as Novation's automap and tablet apps like V-Control are better at controlling Sonar and plugins than Cakewalk's own software, and vastly more user-friendly as well.