dgVoodoo: savior of old-school Windows PC gaming

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Technically an emulator since it can translate old graphics APIs (Glide, DX1+) to DirectX 11. I can't tell how many times this helped me to get old Windows game running on Windows 7/8/10. It's also good at forcing games to run at higher resolutions, forcing MSAA etc.

More information and settings explanation at PCGamingWiki.