GangEd 3.0 beta
The C64 graphics and data editor by The Gang: bitmaps, charsets, sprites, PETSCII, D64 disk images, a 6502 monitor and assembler.
Run it in the browser
Nothing to install. Opening a file uploads it, saving downloads it, and files can be dropped on the page.
Download
Windows: unpack anywhere and run ganged.exe. Settings go to %APPDATA%\GangEd.
Linux: needs SDL2 (libsdl2-2.0-0 on Debian/Ubuntu) and glibc 2.39 or newer.
tar xzf GangEd3-linux-x86_64.tar.gz
./GangEd3/ganged
./GangEd3/ganged