FamiStudio
FamiStudio - NES Music Editor for chiptune artists & homebrewers
Pata Tracker
Chiptune tracker (NES/FM/sampler)
ZestyTS's UWUVCI V3 – Ultimate Wii U Virtual Console Injector
An all-in-one utility used to create custom Wii U Virtual Console titles.
Nasu
The spritesheet editor
PPUX - A tool to make NES graphical hacks
An NES graphics editor, not like the others
NiGo-CHR
A pixel tool for Famicom/NES game development.
MinimemTracker (Compact size cutout tracker)
Original Retro Music Sequencer in Pico-8
Compute 16 Program
Make retro games, music, sprites, and even custom hardware easy!
BeatBax Desktop
Live-coding language and toolchain for retro console chiptunes
FDSynthesizer
FDS sound chip emulation plug-in
CHRxPNG
Generate NES CHR files from PNG images and vice versa
Pickle Obscura
Pixel art camera utility