The best replacement for tekkit is tekkit lite.

The best alternatives to tekkit are rated as following:
★★★★★  tekkit lite
★★★★  tekkit classic
★★★★  voltz
★★★★  ftb
★★★★  bukkit
★★  feed the beast
★★  hexxit
★★  technic
★  attack of the b team
★  ftb unleashed
★  big dig
  technic difference
  moonquest

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

Other search terms related to tekkit and their ratings are:
★★★★★ duncan
★★★★ optifine
★★★ technic launcher
★★★ industrialcraft
★★ equivalent exchange
★ shaders
bukkit
rythain
You have in mind a companion for tekkit and it is not yet here? Propose!



Google Trends

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tekkit
tekkit lite
tekkit classic