reviewboard, 
Announcing Review Board 6!
Review Board 6 is all about focusing on an improved #codereview, graphics review, and #document #review experience in a pleasant environment.
The UI is bright, soft, and colorful. The diffs are easier on the eyes, easier to navigate.
The review process is streamlined, a new review banner guiding you through creating, managing, and publishing review request, reviews, and replies.
https://www.reviewboard.org/news/2023/10/17/announcing-review-board-6/
