The best replacement for coil on plug is coil pack.

The best alternatives to coil on plug are rated as following:
★★★★★  coil pack
★★★★  distributor
★  wasted spark

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Speaking about coil on plug, one probably shouldn't forget about megasquirt.

Other search terms related to coil on plug and their ratings are:
★★★★★ megasquirt
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