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+tweak (ncurses-based hex editor)
+
+Tweak is a hex editor. It allows you to edit a file at very low level,
+letting you see the full and exact binary contents of the file. It can be
+useful for modifying binary files such as executables, editing disk or CD
+images, debugging programs that generate binary file formats incorrectly,
+and many other things.
+
+Tweak uses a complex data structure based on B-trees, designed to make
+almost all editing operations extremely fast, even when they are working
+on huge amounts of data.
+
+Tweak supports insert mode (not particularly useful if you're editing
+an executable file or a filesystem image, but can be extremely handy in
+other file formats such as PNG).
+
+Cutting, copying and pasting within the file you are editing is extremely
+efficient. No matter how big the chunk of data you are moving around -
+even if it's a 200Mb section of a CD image - Tweak will always perform
+the operation effectively instantly.
+
+Tweak supports lazy loading of the input file: rather than sucking it
+all into memory straight away, it simply remembers which parts of the
+editing buffer are copies of which parts of the input file and refers to
+the file on disk when it needs to.