The best replacement for securecrt is putty.

The best alternatives to securecrt are rated as following:
★★★★★  putty
★★★  super putty
★★  iterm2
★★  zoc
★★  xshell
★★  winscp
★  mobaxterm
  putty connection manager

Your alternative for securecrt is not listed? Suggest!
Speaking about securecrt, one probably shouldn't forget about gns3.

Other search terms related to securecrt and their ratings are:
★★★★★ gns3
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securecrt
putty
super putty