One
wonderful blog , dedicated to 99% of Google, recently published a
map of all Google services (from Google Search to Google Zeitgeist) with a description and links. If the format of the map is not interesting for you, then information about the services can be obtained
in the form of a list . Unfortunately, the blog is written in French, but by opening it you will realize that this does not interfere with the receipt of information. In general, as they say, must see :)