The one that came with the leaked beta of TF2, the one that was used to make nope.avi and others. I know that some people in this community once mentioned having used it, but that was ages ago and I have no idea if any of them are still around. But if you are, or if anyone is still in touch with them... Did it have the exact same interface as the official release? Like, is it made in Qt? Because I've long suspected that the version they released to the public was actually a ground-up remake, hence why it took them so long to actually release it to the public. And that the reason for remaking it in Qt was because it would be easy to take cross-platform (even though they never did). I really should have asked this years ago, but it never really occurred to me.