The best replacement for audioslave is ratm.

The best alternatives to audioslave are rated as following:
★★★★★  ratm
★★★★★  soundgarden
★★★★  velvet revolver
★★★  rage against the machine
★  rage

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Speaking about audioslave, one probably shouldn't forget about chris cornell.

Other search terms related to audioslave and their ratings are:
★★★★★ chris cornell
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audioslave
ratm
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