Biological Journals and Abbreviations. Lloyd Hough and Geoff Patton.
A very extensive list of biological journals, arranged alphabetically by abbreviation with full title spelled out. It includes journals in multiple languages. It is not comprehensive but is a very good resource for abbreviations and full titles for current serials.
Journals in NCBI Databases.
Information in this free database includes publisher, frequency, abbreviation, ISSN, and whether indexed in MEDLINE. Since the NCBI databases cover more than just medicine, this source is useful beyond the health sciences. However, it includes only currently active titles.
A database containing information on nearly 100,000 journal titles, including description (aims and scope), abbreviation, homepage, and ISSN.