Why does open-source software have such ugly interfaces?

What is Nice User Interface or Friendly for End user for non CS background.

Create React app

Beakerbrowser

Complain about UI redesign case

  1. Chameleon – http://archive.vn/C3Egu
Chameleon Firefox add-ons user complain about its UI redesign.

Bad and User friendly comparison

Dnsdist – Demo
Knot-resolver mailing list – Demo
MailMan – URL#

IRC must die

Alternative:

  1. Slack
  2. Mattermost – Slack alternative
  3. Gitter
  4. Keybase
  5. Wire
  6. Signal
  7. Jitsi
  8. Talky

References
1. https://www.quora.com/Why-does-open-source-software-have-such-ugly-interfaces