There are 2 repositories under nintendo-3ds-homebrew topic.
A lightweight web app for uploading images, created for the Nintendo 3DS and other legacy web browsers.
Template Project for Code::Blocks for developing 3ds homebrew
🎮📲 Nitro: An NTR client for iOS/iPadOS/macOS.
SDL2 test for Nintendo 3DS in C++ (uses top & bottom screen)
A basic Snake clone for 3DS