I'm always in search of cross-platform tools for NES development, and I wasn't totally happy with any of the graphics tools I had seen, so I decided to make my own. I based the UI / functionality on NES Screen Tool, and it currently has basic but essential functionality (load/save CHR, palettes, nametable; edit tiles; change palettes; easy access to tile indexes / color values / nametable and attr table addresses). It's cross-platform across Windows, Mac, and Linux.
https://famicom.party/neslightbox
https://github.com/kzurawel/neslightbox
Please let me know if you find this useful, if you find any bugs, or if there are any essential features that I'm missing. Thanks!
NES Lightbox: cross-platform NES graphics editor
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