The best replacement for half life is half life source.

The best alternatives to half life are rated as following:
★★★★★  half life source
★★★★  halo
★★★★  half life 2
★★  counter strike
★  bioshock
★  portal
★  terminal half life
★  black mesa
★  deus ex
★  half time
★  doom
★  clearance
★  radioactivity
  duration of action
  radioactive decay
  system shock 2
  long half life
  half life
  far cry
  decay
  elimination half life
  plasma half life
  doubling time
  quake

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Speaking about half life, one probably shouldn't forget about rate constant.

Other search terms related to half life and their ratings are:
★★★★★ rate constant
★★★★ steam
★ drugs
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