Blogger is a service created by Pyra Labs that provides Web-based tools used by individuals to publish to the Web. Pyra Labs is now owned by Google.
The tool Blogger is a service to make weblog publishing easier. The user does not have to write any code or to worry about installing server software or scripts. Nevertheless, the user can influence the design of his or her blog freely.

Blue Club is a bridge bidding system, developed mainly by Benito Garozzo. It was used by the famous Blue Team and became very popular in 1960-1970 (nowadays being less and less used).
The main features are:

Yahoo! Calendar is a Web-based calendar service from Yahoo! It is one of the biggest online calendar providers on the Internet, serving millions of users (others include Hotmail).
Fog of war in a computer game. Black squares represent unknown terrain. Darkened ones have been explored, but are not currently observed by the player.