The best replacement for carrierwave is paperclip.

The best alternatives to carrierwave are rated as following:
★★★★★  paperclip

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Speaking about carrierwave, one probably shouldn't forget about minimagick.

Other search terms related to carrierwave and their ratings are:
★★★★★ minimagick
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Google Trends

Scale is based on the average worldwide traffic of carrierwave in all years. Click on graph for more.
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paperclip