You can find JISCMail lists in your field of interest by browsing the Category Pages or using the Keyword Search feature above. There are also A-Z Indexes and Recently Created Groups for you to browse through.
NB: Groups can be configured as "confidential" so that they do not appear on any of these pages, Therefore, you will only be able to search for non-confidential groups.
Notes on terminology:
There are always many ways to say the same thing! Below are some terms used to describe JISCMail Groups: