Seeed Studio's Open Parts Library: commonly used electronics components

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http://www.seeedstudio.com/depot/OPLopen-parts-library-catalog-c-136_138/

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There's also a corresponding Wiki page, with their Eagle library for all the components handy: http://www.seeedstudio.com/wiki/Open_parts_library.

No idea if anyone has converted this to e.g. KiCad, I've searched around but not found anything. That would be a nice addition.

Disclaimer: I'm not associated with Seeed Studio in any way, except being the occasional customer. :)