The best replacement for antialiasing is hdr.

The best alternatives to antialiasing are rated as following:
★★★★★  hdr
★★★  anisotropic
★  multisampling
★  anisotropic filtering
  aliasing

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Speaking about antialiasing, one probably shouldn't forget about gimp.

Other search terms related to antialiasing and their ratings are:
★★★★★ gimp
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antialiasing
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