They were all replaced with SSMS, which was a slow abomination.
Query Analyzer is my favourite SQL editing environment to this day. It was incredibly snappy, could render thousands of rows without skipping a beat and had a nice explain visualisation built in. If there was a modern rewrite that supported PostgreSQL, I'd buy it in an instant.
There are screenshots in these articles if anyone's interested:
http://etutorials.org/SQL/microsoft+sql+server+2000/Part+II+...
https://www.sqlservercentral.com/articles/using-query-analyz...