widl
There are 3 repositories under widl topic.
wapc/widl-spec
WebAssembly Interface Definition Language (WIDL) specification
KOLANICH-wine/widl
Wine IDL compiler for Component Object Model
KOLANICH-libs/MinGWSAPI5SDK.cmake
The set of scripts allowing to plug vanilla IDL files from Microsoft Windows / Speech SDKs to be used with FOSS C/C++ compilers