Back in March, AMD announced the V-EZ Vulkan wrapper, with an aim to make Vulkan development easier. Now it seems they have open sourced it.
V-EZ is an open source, cross-platform (Windows and Linux) wrapper intended to alleviate the inherent complexity and application responsibility of using the Vulkan API. V-EZ attempts to bridge the gap between traditional graphics APIs and Vulkan by providing similar semantics to Vulkan while lowering the barrier to entry and providing an easier to use API.
When they initially announced V-EZ, they said it would be closed source and they would be working with "professional ISVs who would benefit from acquiring the source code".
I've seen a lot of developers mention how Vulkan really is a much more complex beast, which makes sense since it's supposed to be closer to the hardware than OpenGL with a smaller, leaner driver giving developers more power and control. That's not great for everyone though, so projects like this are still going to be useful. Previously, their GitHub page said "V-EZ is not aimed at game developers.", however they seem to have removed that now too.
AMD did say that the overhead from using the wrapper should be "negligible and measured in the range of microseconds for tens of thousands of API calls".