The best replacement for dos is ddos.

The best alternatives to dos are rated as following:
★★★★★  ddos
★★★★★  unix
★★★★  windows
★★★  linux
★★  do's
★★  linux commands
★★  mds
★  gui
★  don'ts
★  command prompt
★  ms dos
★  bash
★  powershell
★  incog
★  ddos attack
★  disk operating system
  unix commands
  terminal
  unix format
  ms windows
  cmd
  windows 98
  windows csv
  nos
  to do's
  unix file format
  windows mount point
  don ts

Your alternative for dos is not listed? Suggest!
Speaking about dos, one probably shouldn't forget about ping.

Other search terms related to dos and their ratings are:
★★★★★ ping
★★★★★ floppy
★ usb
★ starting windows
★ ntfs
★ hping3
You have in mind a companion for dos and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dos in all years. Click on graph for more.
dos
ddos
unix