The best replacement for osi is tcp.

The best alternatives to osi are rated as following:
★★★★★  tcp
★★★★★  tcp ip
★★★★  tcp ip model
★★★★  dod
★★★  internet model
★★★  tcp/ip
★★★  ip
★★  tcp/ip model
★★  dod model
★★  fsf
★★  tcp\/ip
★  sna
★  ip model
★  tcp model
★  tcp/ip layers
★  tcp/ip stack
  tcp ip layers
  tcp\/ip layers
  internet layer
  tcp ip reference model
  tci ip

Your alternative for osi is not listed? Suggest!
Speaking about osi, one probably shouldn't forget about tcp ip.

Other search terms related to osi and their ratings are:

★★★★★ tcp ip
★★ tcp\/ip
You have in mind a companion for osi and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of osi in all years. Click on graph for more.
tcp ip