Banana OS got a hell of an update!
The video is the OS running in QEMU

• Cached rendering: Allows high resolutions like the one in the video (1920x1080)
• Antialiased fonts: Allows any antialiased font to be used in the OS! The font used in the video is Monaco.
• Transparency
• Batch scripting: If you watch the entire video, you will see 3 commands being used
• Fixed ATA driver, works better now
• Added PS/2 Keyboard driver, fixed PS/2 Mouse driver

Thanks NeGate for giving me the cached rendering idea
https://github.com/waternine9/BananaOS