The best replacement for computercraft is redpower.

The best alternatives to computercraft are rated as following:
★★★★★  redpower
★★★★★  opencomputers

Your alternative for computercraft is not listed? Suggest!
Speaking about computercraft, one probably shouldn't forget about redpower.

Other search terms related to computercraft and their ratings are:
★★★★★ redpower
★ icbm
You have in mind a companion for computercraft and it is not yet here? Propose!



Google Trends

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computercraft
redpower
opencomputers