I know this makes me late to the party, so can anyone comment on similarly dominant/official tools in their language of professional experience?
A web search can find tools, but it’s hard to know when one is likely to be “blessed” by potential future project teams.
Java: Probably google-java-format
Python: autopep8, yapf, and black are all widely used and I don't think any of them is dominant. I personally favor black, as it's the only one of the three that strives to leave as few degrees of freedom as possible (i.e., the same source code is always formatted the same way).
Flake8 + Black for Python do a good job
Java: Eclipse/Netbeans/InteliJ configured for Sun's conventions