The best replacement for paperclip is carrierwave.

The best alternatives to paperclip are rated as following:
★★★★★  carrierwave
★★★★  staple resume
★★  attachment_fu
★  dragonfly
★  paper clip
★  staple
★  stapler
★  staple cv
★  staple tax return

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Speaking about paperclip, one probably shouldn't forget about amazon s3.

Other search terms related to paperclip and their ratings are:
★★★★★ amazon s3
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Google Trends

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paperclip
carrierwave
staple resume