D9VK - A d3d9 to vk layer based off DXVK's codebase.
MSI Afterburner - Tool to manage video cards. Shows video card stats (temp, GPU usage, etc.).
DXVK - Vulkan-based D3D11 implementation for Linux / Wine
ASUS GPU Tweak - ASUS GPU Tweak fully implements TechPowerUp’s GPU-Z analysis and monitoring features.
Direct3D 9-to-11 - Direct3D 9 to Direct3D 11 converter.
Guru3D - Guru of 3D: PC Hardware Reviews and tests