This is an interesting open source project! vkBasalt is a new Vulkan post processing layer that currently supports Contrast Adaptive Sharpening.
Unlike Radeon Image Sharpening, vkBasalt supports Linux and works with both NVIDIA and AMD. This isn't entirely reinventing the wheel though, as it's partly based upon the ReShade port of AMD's CAS. Still, it's fun to see what hackers are able to do with little layers like this, especially when we don't have official support.
Want to see the difference it makes? The developer included a comparison shot of Skyrim:
See a bigger comparison on this dedicated page.
Seems like a really fun idea, although the result might not be to everyone's tastes it's very much personal preference. It does make it look quite a lot sharper to my eyes.
It's already seeing plenty of activity on GitHub with others helping out, in time this could be quite an interesting Vulkan layer if more options get added in.
You can find it on GitHub.
Hat tip to RTheren.