ImpLib SDK
ImpLib SDK produces custom Import libraries for Windows DLL
...An alternative is to generate these import libraries using the ImpLib SDK, as it doesn't restrict redistribution.
The ImpLib SDK is free even for commercial use and redistribution of any kind, as long as all copyrights are preserved.
Guide: https://implib.sourceforge.io/EN.HTM
GitHub repo: https://github.com/vkamenar/implib-sdk