This is a very simple but useful application for viewing the sequence of bytes or bits in a binary file. I have modified my old bytes viewer and added the option to view the sequence of bits as well.
You can choose the start and end index of the bytes / bits being viewed.
This is how the application looks:
The application also supports dragging and dropping files into the form.
You can use it together with Fiddler by selecting a session and then choosing for example File - Save - Request - Request Body.... Then open it with the bytes viewer to view the sequence of bits and not only bytes as it is in HexView of Fiddler.
And the executable (requires .NET 2.0 installed):