Heterodoxy (n)
Where multiple views are not just permitted, but encouraged.
Heterodox Academy
I’m a fan of Heterodox Academy, an organization advocating for viewpoint diversity, esp. in Academia. Given the developments of the recent years — esp. the Endarkening, or Unenlightment, or whatever you’ll call it, there is a need to encourage and defend viewpoint diversity. Especially on campus. Their video explains it pretty well:
More information on Heterodox Academy. Worth having a look.