The best replacement for showdown is vexilar.

The best alternatives to showdown are rated as following:
★★★★★  vexilar
★★★  flasher
★★★  dirt 3
★★  marked
★★  shade splitter
★★  pokemon online
★★  showdown
★  xiaolin chronicles
  lords of vegas
  dirt 2

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showdown
vexilar
flasher