There are alternatives to Google Earth such as NASA World Wind from a desktop application perspective.
Google Earth is available as a free and paid Pro version (no source code is available). NASA World Wind is open source project and source code is available. World Winddiffers from Google Earth in that there is no one and 'official' World Wind application, instead there are many demos and programs with different functionalities created both by NASA and users from around the world.
For high-end GIS users ESRI sells a suite of 2-D and 3-D Map-related products (ArcGis, ArcMap, etc.)
From a web browser context there is Google Maps, which is integrated with Google Earth and shows some of the same map data. No download or installation is required.
There is also Microsoft's Bing Maps, formerly known as Virtual Earth, with their impressive "bird's eye" aerial photos.
Other mapping web sites with satellite imagery are also available. See related questions and related links for more details.
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You can go to your local county web page. There should be a section for taxes and there will be a GIS Mapping tool on there. As long as you know the property address you can see images.
In addition to Google Earth you can use Google Maps directly from your web browser. You also use Bing Maps which is Microsoft's equivalent to Google Maps.
Google Maps is a website you visit in your web browser. There is no software to download like you do for Google Earth. Both Google Maps and Google Earth are free to use. See URL in related links below.
Google Earth is free to use for everyone just like Google Maps. Google Earth Professional can be purchased for $399 a year which comes to $33.25 a month.
The latest (non-beta) version of Google Earth is 7.1.7.2605 released in Oct 2016. The previous stable version was 7.1.6 released in May 2016. The initial version was released in 2001. The 7.x and 6.x versions of Google Earth version include Street View, viewing Mars, Sky view, looking under water at things like the RMS Titanic, a Flight Simulator, among other useful features. Note as of Jan 2012 Street View is no longer be supported in Google Earth 5.2 or older.
I guess it is free to use however, you cannot distribute it on your own. In free version you cannot integrate your GIS data but there are another versions like Google Earth pro and Google Earth enterprise.
See related links for lots of "secrets" and interesting places found in Google Earth.Also try searching for "secrets google earth" in any search engine (like Google) and you'll see lots of hits.If you mean "secret" or hidden features in Google Earth (also known as "easter eggs") then see related questions.