Command-line tools for writing disk images, and a GUI for exploring them.
I made these tools in 2008 with a UI to create and modify disk images.
I used them for building my hobby operating system at the time (https://github.com/joshwyant/myos).
In 2018 (10 years later), I published the tools to github, converted the command-line tools to dotnet core, and published a docker image (https://hub.docker.com/r/joshwyant/vdisk-tools/).
The docker image doesn't contain the GUI.
Example usage (taken from myos):
echo creating disk image...
vmkimg -i hdd.img -M $DISKSIZE -b bin/bootsect -t $DISKTYPE>>/dev/zero
echo copying files...
vput hdd.img ./bin/osldr /osldr
vmkdir hdd.img /system/bin
vput hdd.img ./bin/kernel /system/bin/kernel
vput hdd.img ./bin/shell /system/bin/shell
vput hdd.img ./bin/vesadrvr.o /system/bin/vesadrvr.o
echo setting attributes...
vattr hdd.img /osldr rhs
vattr hdd.img /system/bin/kernel rs
vattr hdd.img /system/bin/shell rs
vattr hdd.img /system/bin/vesadrvr.o rs