from Homepage:

This program is not completely finished, not all of the features that I’d like are included yet. There may also be bugs that I have not found, but I’ve fixed all of the bugs I’ve found so far.

Here some features:

• Read D64 files, display the directory, move files around the directory, rename files.
• Export files from the D64 into PRG files.
• Import files into the D64 with autodetection for P00 files.
• View/Edit the BAM.
• View the block chain of files on the D64.
• Create new blank D64 files, clean existing D64′s.
• View and modify blocks on the disk in hex.
• Automatic check for crosslinked files on the D64.
• View the directory using the native c64 font.
• SEQ File Viewer using the c64 font with PETASCII->ASCII conversion option.
• Drag and Drop functionality. Drag D64′s onto the main screen to load them, drag other files to import them.
• Preliminary support for importing T64′s.
• A filename builder to enable easy use of the C64 Characterset in filenames.

source: d64editor.com