To find diverse viewpoints in many languages, you can limit by language. Below are two databases with much content in many different languages.
This guide gives you great pointers on the best databases and resources for your field. Don't forget that you can find help on 24/7 LIVE CHAT at any time of day or night. You can also email the CLA librarian, Brett Bodemer, at bbodemer@calpoly.edu.
JSTOR is a full-text database of scholarly journals and ebooks. Journal content typically starts with the earliest volume but does not include the most recent 3-5 years. JSTOR also includes the entire database of rights-cleared images formerly found in Artstor, as well as images and primary source collections contributed by member organizations.