The best replacement for nistune is power fc.

The best alternatives to nistune are rated as following:
★★★★★  power fc
★★★★  jwt
★★★★  megasquirt
★★★★  emanage
★★★★  haltech
★★★★  enthalpy
★★★  aem ems
★★  zemulator
★  apexi

Your alternative for nistune is not listed? Suggest!
Speaking about nistune, one probably shouldn't forget about map sensor.

Other search terms related to nistune and their ratings are:
★★★★★ map sensor
★ anti lag
You have in mind a companion for nistune and it is not yet here? Propose!



Google Trends

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nistune
power fc
jwt