The best replacement for ruby 1.9 is jruby.

The best alternatives to ruby 1.9 are rated as following:

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Speaking about ruby 1.9, one probably shouldn't forget about rails 2.3.

Other search terms related to ruby 1.9 and their ratings are:

★★★★★	rails 2.3
★★★	rails 3

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ruby 1.9

jruby

python 3