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知名度の割に優秀なCSSフレームワーク

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教えてください。
自分が使っているのはメジャーなtwitter bootstarapですが、他にも色々ありそうなので、おすすめのものがあれば簡単な解説をお願いします。複数の視点があるといいので、かぶっても気にせず書いて頂けると嬉しいです。

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