I just put back online a website dump of the excellent jj1odm hacker. He’s the japanese man behind the SD Card adapter for the Dreamcast. Click here to access to the dump.
I just released gditools.py GUI for Windows and Linux 64-bit for the excellent gditools.py script by FamilyGuy. This Python script was made to handle GD-ROM image files (*.gdi) on several platforms. If you’re interested, go here.