CFF Explorer was designed to make PE editing as easy as possible, but without losing sight on the portable executable's internal structure. This application includes a series of tools which might help not only reverse engineers but also programmers. It offers a multi-file environment and a switchable interface.

Is CFF Explorer free?

A freeware suite of tools including a PE editor called CFF Explorer and a process viewer.

What is a PE editor?

Pe, short for Programmer's Editor, is an open source text editor for the Be Operating System (BeOS), Haiku and other BeOS-like operating systems. It is targeted towards source-code editing, and features syntax highlighting for a large number of programming languages.