EDB Linux Debugger v 0.9.1
One of the main goals of this debugger is isolation of the debugger core from the display you see. The interface is written in QT4 and thus source portable to many platforms. The debugger core is actually a plugin and the platform specific code is isolated to just a few files, porting to a new OS would require porting these few files and implementing a plugin which implements the "DebuggerCoreInterface" interface. Also, because the plugins are based on the QPlugin API, and do their work through the DebuggerCoreInterface object, they are almost always portable with just a simple recompile. So far, the only plugin I have written which would not port with just a recompile is the heap analysis plugin, due to it's highly system specific nature.