I´ve coded a simple tool to convert Dreamcast savegames between Nexus .DCI format and .VMI/.VMS format.
I know there are other tools to do this same job, but I think this is the first tool to handle both-way conversions (DCI <-> VMI/VMS) without any other parameter than source file (a DCI or VMI file) and destination file (for .DCI target) or resource name (for .VMI/VMS target).