Euscan is both a tool to check if an ebuild is outdated (app-portage/euscan) and a web interface.
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This web interface allow you to browse the portage tree, and find outdated ebuilds. It was designed to help maintainers monitor their packages and bump them.
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euscan code source is available at <ahref="http://git.iksaif.net/?p=euscan.git;a=summary">http://git.iksaif.net/?p=euscan.git;a=summary</a>.