Disk Image Manager
Disk Image Manager (previously SPIN Disk Manager) is a Windows application for examining and manipulating disk images in the Extended DSK format used by many Spectrum and Amstrad emulators.
Source and documentation can be found at GitHub.
This software is licensed under the Apache 2.0 Licence.
Screenshot identifying a disk format and details.
Screenshot showing the visual map feature.
Screenshot showing the find sector data and hex/ASCII viewer.
Screenshot showing advanced formatting options.