The best replacement for open university is birkbeck.

The best alternatives to open university are rated as following:
★★★★★  birkbeck
★★★★  university of london external
★★★  distance education
★★  university of london
★★  unisa
★  rdi
★  open university
★  fernuni hagen
  regular university
  london external

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Speaking about open university, one probably shouldn't forget about openlearn.

Other search terms related to open university and their ratings are:
★★★★★ openlearn
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open university
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university of london external