Icons: Crystal Clear by Everaldo Coelho and Nuvola by David Vignoni, both under the GNU LGPL 2.1. The pixel-art GBA and radio icons are drawn for this site (scripts/pixel-icons.py).

Sounds: the 3DS's power-on jingle and lid tones are Nintendo's (via TWiLight Menu++); the lid's clap and snap are from a recording of a real original 3DS (this video).

GBA Player: EmulatorJS (GPL-3.0) running the mGBA core (MPL-2.0). ROMs you load stay in your browser.

Font: M PLUS 1 by the M+ Fonts Project (SIL Open Font License).

Inspiration: the Nintendo 3DS HOME Menu. This is a fan-made homage, not affiliated with Nintendo.