Nasu is a spritesheet editor.
Nasu is a spritesheet editor created to help with the design of interfaces and assets for various Famicom projects. Nasu can import/export in the .chr file format, copy/paste suing the snarf buffer, it can also generate theme files.
As of 2021, the application is distributed as a rom for the Varvara system, you can download the assembled rom here, or find the source code here.
15J11— Nasu Uxn Release
14S13— Nasu Desktop Release
14C05— Nasu Original Version
incoming roms dito graf3dscene donsol famicom yufo chr format nmt format