While repology tries its best in matching packages across different repositories, this is quite a complex task:
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There may be multiple unrelated software projects with a same name (for instance, clementine is both X11 window manager and a media player).
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Current reports (1)
Created more than a year ago,
The metapackage needs to be split into multiple metapackages
Comment: The "jade" for gentoo is not the James Clark jade.
It is for "JADE is FIPA-compliant Java Agent Development Environment", an entirely different package.
I suggest "java-ade" or "java-jade" as the new metapackage.