TC Powercore plugins.
If one reads carefully the announcements TC made earlier this year, they say they will continue to support the Powercore platform. They do: in fact they just released another update (v 4.4.3) of their drivers. What they also say is that they will not continue development on the platform, that is: make new plugins.
That means, we can keep using the Powercore for new projects. And if we have bugs, their Support will continue to address them. You may read testimonies of users working with Nuendo 64-bit on the Powercore Forum.
A great way to keep longtime users happy and working with trustable tools.