ddd is a graphical front-end to gdb. I found it especially useful for visualizing the contents of structures. When you hover your mouse over a variable, it displays the value it contains in a popup. That really sped up visualizing the current state of the program for me. Of course, it also makes stepping, handling break points,... (the usual debugger stuff) more convenient than typing into the command line. It isn't an IDE, but it might be helpful to a linux debugging newbie.
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