The best replacement for octalink is isis.

The best alternatives to octalink are rated as following:
★★★★★  isis
★★★★★  square taper
★★★  hollowtech
★★★  hollowtech 2
★★  isis drive
★  external bottom bracket
★  kwadrat
★  vierkant
★  hollowtech ii
★  taper

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octalink
isis
square taper