Answer by Grant Fritchey ·
Answer by Cyborg ·
Answer by Leo ·
Answer by TimothyAWiseman ·
It partially depends on what you are trying to monitor, and it is not free, but I personally have been impressed by SQL Monitor https://www.red-gate.com/products/dba/sql-monitor/
Answer by indexer ·
Answer by ThomasRushton ·