Openly Jake is the more commercial one. GNUJake is the older development search engine site. This site also gives the ISI impact factor for these journals when available. Entries can be searched or browsed. Searchable database of 35K journals 24K newsletters and 11K newspapers.
Subscribers can pay for more powerful searches, name or category searches are free.
This list of links is compiled and maintained by Emory University . The authors of MedWebPLUS had now left Emory, but this list is related to the original MedWeb which was a very comprehensive list of e-journals on the web . This site now requires registration and password, although it is still free. This is a great site edited by an Italian librarian. Finder A search page for books, journals, electronic texts, etc.