The best replacement for d66 is 38r.

The best alternatives to d66 are rated as following:
★★★★★  38r
★★★★★  gtp38r
★★★★  pvda
★★★★  h2e
★★★★  vvd
★★★★  s366
★★★  groenlinks

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d66
38r
gtp38r