This paper presents Lancet, a multi-platform software visualization tool that enables the inspection of programs at the binary code level. Implemented on top of the link-time rewriting framework Diablo, Lancet provides several views on the interprocedural control flow graph of a program. These views can be used to navigate through the program, to edit the program in a efficient manner, and to interact with the existing whole-program analyses and optimizations that are implemented in Diablo or existing applications of Diablo. As such, Lancet is an ideal tool to examine compiler-generated code, to assist the development of new compiler optimizations, or to optimize assembly code manually.