Icarus Adventure System let you create your own adventure game using a comfortable UI on a Windows PC. The created adventures will compile into a single NDS binary. Unfortunatly the tools is available in spanish language only.
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Thanks to http://dcemu.co.uk for the news.

AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)