Downloads
Here are some tools that you may want. I mirrored these because many of the original sites are no longer being maintained. If you don't trust them, don't download them.
Geckocodes.org Text File Mirror
RAM Dump/Gecko Coding Tools
USB Gecko Source (GCode)
Latest USB Gecko Drivers (FTDI Chip) (Dropbox, Mega, GDrive) (VirusTotal Scan)
Gecko dotNet (Dropbox, Mega, GDrive) (VirusTotal Scan)
WiiRd (Dropbox, Mega, GDrive) (VirusTotal Scan)
PyiiASMH (Dropbox, Mega, GDrive) (requires Python, Qt, and PyQt) (VirusTotal Scan)
ASM<->WiiRd Converter (Dropbox, Mega, GDrive) (VirusTotal Scan)
HxD (local) or HexEd.it (web-based)
Ocarina Code Manager (Dropbox, Mega, GDrive) (VirusTotal Scan)
Gecko OS (Dropbox, Mega, GDrive) (VirusTotal Scan)
GCT to TXT Converter (GDrive) (VirusTotal Scan)
ISO Modding Tools
FF Viewer (Dropbox, Mega, GDrive) (VirusTotal Scan)
Wii ISO Renamer (Dropbox, Mega, GDrive) (VirusTotal Scan)
Trucha 0.2.1 (Dropbox, Mega, GDrive) (with premade keyset) (VirusTotal Scan)
Misc Tools
Button Activator Calculator (Dropbox, Mega, GDrive) (VirusTotal Scan)
Custom Mii Tool (Dropbox, Mega, GDrive) (requires Adobe AIR) (VirusTotal Scan)
Mario Kart Tools
Bullet Bill Speed Modifier (GDrive) (VirusTotal Scan)
Mario Kart Wii Code Generator (GDrive) (VirusTotal Scan)