GeoSmart automatically adds city-precise location information for each comment author to comment metadata for each comment and a map showing comment author location distribution. GeoSmart also ships with a multiple instance capable sidebar widget that displays a map showing the locations of the most recent visitors to your blog.

GeoSmart

Automatically adds city-precise location information of comment authors to comment metadata.

Pichel

Displays IP address, operating system, browser type and origin of the visitor by shortcode or as Widget in Sidebar.
Usage
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Place the widget to your Sidebar.
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You can use the shortcode [about-visitor] to include informations in your posts or pages. 
optional Parameters: 
ip=0 to hide IpAddress 
os=0 to hide Operating System 
browser=0 to hide the Browser 
location=1 to show the location/origin 
Examples: 
List of default informations: [about-visitor] 
List of default informations including location: [about-visitor location=1] 
List only the IP Adress: [about-visitor os=0 browser=0]
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Without sidebar you can display informations by including in php-code by using then function ‘js_aboutvisitor_display’. 
parameter array: 
ip=>0 to hide IpAddress 
os=>0 to hide Operating System 
browser=>0 to hide the Browser 
location=>1 to show the location/origin 
Examples: 
List of default informations: 
List of default informations including location: 1)); } ?> 
List only the IP Adress: 0;browser=>0)); } ?>
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WP Js About Visitor

Displays IP address, operating system, browser type and origin of the visitor by shortcode or as Widget in Sidebar.

GeoSmart vs WP Js About Visitor