Bloomberg Price charts and tables for equities, commodities, currencies, indexes and more. Minimal free information (and delayed pricing) on their web site.
Compustat Research Insight Twenty years of monthly stock prices (high, low, close) can be viewed and downloaded using the Report Assistant and choosing the report "Items vs. Time for a Company".
Datastream Use Datastream for daily, weekly, monthly, quarterly, and yearly stock prices and other financial indicators. Often includes data on acquired or merged companies.
Factiva Choose Quotes and type in a ticker symbol or company name for a Current quote. Choose Company Screening for screening companies by several criteria.