What Software Can I Use For Locate Several Addreses On A Map?

I’m working on the design of transportation routes and i need to locate costumers, an also be able to make that map a little more helpful, something like “The SIMS” population/pollution/traffic/wheater maps. Is anything like that on Mac or PC?

Will Linking Several Websites To Each Other Give Me Better Search Engine Optimization Results?

My business has 4 separate websites. If I linked all of these sites together would I get better SEO results? If I linked every page on every site to every page on the other sites, would this help also? Any tips would be appreciated! Thanks!
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