CodeLite is an open-source, cross platform IDE for the C/C++ programming languages.
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Pro Modest memory footprint
CodeLite takes up about 50MB when loaded into memory with a workspace opened.
Pro Open source and free
Pro Cross platform
Works on Windows, OS-X and Linux.
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).
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.