A printable list of journal titles indexed (PDF file, 550kb. 134 pages. Formatted for British A4-size paper — no longer updated).
You can also see a smaller, hyperlinked and categorised, selection of titles at the JURN Directory. At over 3,000 titles, this Directory omits the non-English titles (these are usually in the main JURN site-index because they have some free English-language articles). The Directory also omits most of the titles offering only a negligible part of their contents (e.g.: book reviews only).