Whisper64 is a feature-rich text editor for the Commodore C64 computer with BASIC syntax highlighting, find and replace, copy/paste and automatic line renumbering for BASIC programs. The editor includes a built-in directory browser for easy file loading and saving, supports multiple drives, and can handle files up to 256 lines per page with paging support for larger files. Whisper64 is developed by Marcin Spoczynski.