xrn
One of the first graphical newsreaders: Usenet in an X11 window, with buttons instead of single-letter commands.
In the 1980s Usenet was read in a terminal, with rn and its keyboard shortcuts. xrn was written at UC Berkeley towards the end of the decade and moved the same workflow onto the X Window System: a list of groups, a list of articles, and buttons to move on, reply or mark everything read. Articles came over NNTP rather than from a local spool, so the workstation did not have to be a news server itself.
It was maintained for a long time and shipped with plenty of Unix distributions. It never looked especially modern, but that was never the point — it was rn for people who already had a mouse on the desk.