Bulk Image Downloader
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Full user review
"Solid workhorse for many years"
Easy to use without tweaks on most sites. For others there's an Advanced Configuration that let's you define what to download and what to ignore. It's also smart enough to handle multi-page galleries.
For some web pages the user has to define what to include and what to ignore by using "regular expressions" which are always tricky. A little more help in that area would be nice.
I've used this for years to download all sorts of galleries even from sites that seem intent on keeping the user from doing bulk downloads. It's solid and reliable.