VirtualBox[.]org
Still a problem child, for me at least. My Linux Mint VM takes forever to start, so much so that I've given up on it until hopefully the next release. And memory-related crashing problems with one Win11 VM continue. It works fine with older versions of VBox. The problem goes away if I uncheck use 3D acceleration. To try & make sure it wasn't a Windows issue I upgraded the VM to 25H2, with no change.