Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes.
minor feature: Major progress on the WineD3D Vulkan backend. Initial support for splitting dlls into PE and Unix parts. Support for generating PDB files when building PE dlls. Timestamp updates in the Kernel User Shared Data. Various.