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Sites like DxOMark provides a lot of information about lenses but they generally don't provide any really usable information about the focus breathing protperties of the lenses. In fact I don't know a single website or other source that systematically tests and presents the focus breathing properties of lenses at different focus distances.
Are there any good resources that provides this information?
There are currently no resources that specifically note which lenses exhibit "focus breathing". However, many lens databases do note whether lenses use internal focusing mechanisms, which potentially reduces focus breathing.
Unit-focusing and back-focusing lenses would be expected to exhibit focus breathing because the size of the image circle changes with focus. I'm not sure with front-focusing lenses, but I'd expect them to be similar to internal-focusing lenses.
If you're really, really curious, you'd have to read into some professional reviews. There isn't a true method for measuring breathing, unlike MTF curves or distortion figures, since it's difficult to quantify, and everyone has a different metric for measuring it. Ken Rockwell does a pretty good job with qualitatively describing it, but he isn't perfect, and some don't have information.
