What is Minix Fileystem Tool (mfstool) you ask? Simply, it allows you to manipulate Minix filesystem images as a normal (i.e. non-root) user. It doesn't require you to mount the image file to copy files on it. It doesn't even require you to be the superuser to make device nodes or set group/user ids.
Releases are vailable from the SourceForge files page.
For support, contact go to the Project Support page.