Would be nice to have .NET Core available in Gentoo. DESCRIPTION=".NET Core open-source general-purpose development platform maintained by Microsoft and the .NET community" HOMEPAGE="https://dotnet.github.io/" LICENSE="MIT"
You may be interested in the Dotnet project: https://wiki.gentoo.org/wiki/Project:Dotnet
We have dotnet-sdk-bin in ::gentoo, there is ongoing work to package the non-binary version.