CodeLite is an open-source, cross platform IDE for the C/C++ programming languages.
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Pro File Explorer-like workspace view
The workspace view, unlike other IDEs, is a reflection of the actual directory structure on the file system (with user filters applied).
Pro Open source and free
Pro Modest memory footprint
CodeLite takes up about 50MB when loaded into memory with a workspace opened.
Con Bland UI
The UI is fairly boring and has limited customization options.
There is a dark theme available, however it only applies to the editor. The surrounding windows and borders remain light.
You can see a collection of screenshots here.