The best replacement for lm324 is lm358.

The best alternatives to lm324 are rated as following:
★★★★★  lm358
★★★★★  lm386
★★★★  lm348
★★★★  lm741
★★★★  tl084
★★★★  lf347
★★★★  tl074
★★★  lm339
★★★  lmv324
★★  lm224
★★  lm2902
★  lm124
★  tl082
★  tlc274
  tl072

Your alternative for lm324 is not listed? Suggest!
Speaking about lm324, one probably shouldn't forget about ir sensor.

Other search terms related to lm324 and their ratings are:
★★★★★ ir sensor
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lm324
lm358
lm386