The best replacement for grabit is newsleecher.

The best alternatives to grabit are rated as following:
★★★★★  newsleecher
★★★★  sabnzbd
★★★  newsbin
★★  speedout
★  unzbin
★  newsbin pro
★  binreader
★  mimo
★  newsrover
★  grabit pro
★  altbinz
  spotnet
  pro grabit

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

Other search terms related to grabit and their ratings are:
★★★★★ giganews
★★★ astraweb
★ nzb files
You have in mind a companion for grabit and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of grabit in all years. Click on graph for more.
grabit
newsleecher
sabnzbd