The best replacement for ckfinder is imce.

The best alternatives to ckfinder are rated as following:
★★★★★  imce
★★★  ckfinder
★★  elfinder

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Speaking about ckfinder, one probably shouldn't forget about ckeditor.

Other search terms related to ckfinder and their ratings are:
★★★★★ ckeditor
ckeditor drupal
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