Erik Darling has a new free tool:
Stop clicking through SSMS execution plans like it’s 2005.
Performance Studio is a free, open-source plan analyzer that tells you what’s wrong,
where it’s wrong, and how bad it is — from the command line, a desktop GUI,
an SSMS extension, or an AI assistant.Built by someone who has stared at more execution plans than any reasonable person should.
Click through for some of its capabilities, as well as how to get your hands on a copy.