The best replacement for multiplexer is decoder.

The best alternatives to multiplexer are rated as following:
★★★★★  decoder
★★★★  shift register
★★  switcher
★★  multiplexer
★★  multiplexor
★★  mux
★★  demultiplexer
★  pog
★  concentrator
  an fdm multiplexer

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Speaking about multiplexer, one probably shouldn't forget about nand gate.

Other search terms related to multiplexer and their ratings are:
★★★★★ nand gate
★ boolean function
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multiplexer
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