The best replacement for telrad is rigel.

The best alternatives to telrad are rated as following:
★★★★★  rigel
★★★  finderscope
★★★  red dot finder
★  ez finder
★  rigel quickfinder
★  finder
  quickfinder

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Speaking about telrad, one probably shouldn't forget about stellarium.

Other search terms related to telrad and their ratings are:
★★★★★ stellarium
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Google Trends

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telrad
rigel
finderscope