The best replacement for pronterface is repetier.

The best alternatives to pronterface are rated as following:
★★★★★  repetier
★★★  cura

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Speaking about pronterface, one probably shouldn't forget about skeinforge.

Other search terms related to pronterface and their ratings are:
★★★★★ skeinforge
★★ slic3r
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pronterface
repetier
cura