The best replacement for meld is beyond compare.

The best alternatives to meld are rated as following:
★★★★★  beyond compare
★★★★  child pugh
★★★★  kdiff3
★★★★  diffuse
★★★  melt
★★  kompare
★★  winmerge
★★  child-pugh
★★  kdiff
★  vimdiff
★  araxis
★  peld
  xxdiff
  mind melt

Your alternative for meld is not listed? Suggest!
Speaking about meld, one probably shouldn't forget about svn diff.

Other search terms related to meld and their ratings are:
★★★★★ svn diff
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Google Trends

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meld
beyond compare
child pugh