The best replacement for gateways is routers.

The best alternatives to gateways are rated as following:
★★★★★  routers
★★  warp gates
★★  bridges
  cgi based gateways
  screening routers
  signaling gateways
  dells

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No companions for gateways have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of gateways in all years. Click on graph for more.
gateways
routers
warp gates