Nesbox is a lightweight microVM hypervisor designed for cloud gaming that enables multiple Linux guests to share a single GPU with near-native performance, booting to userspace in about one second. Guests render within 2% of bare metal performance and can be isolated from each other while sharing the same graphics card through virtio-gpu and rutabaga_gfx, without requiring GPU drivers in the guest OS.
WinBoat's Helios is an API-level paravirtualization tool for 3D GPU acceleration in virtual machines, not a traditional vGPU. It forwards graphics calls from a guest Windows system to the host Linux GPU via a custom Vulkan driver and virtio channel, meaning guest applications lack direct GPU access and cannot use CUDA, NVENC, or DXGI.