radare offers a graphical interface for browsing the code graphs. It uses an own-made Vala library called 'grava' that permits the creation of graphs using Gtk+Cairo easily. To open a new window displaying the code analysis graph type: 'ag'.
[0x08048923]> ag ... gui ...
The grava window permits opening new nodes with the content executing a certain command (!regs, x@esp, ..), and offers a simple interface for debugging allowing to browse the code with the mouse and set breakpoints with the contextual menu over the nodes.