Traceroute

Network packets sniffer

Whois

Traceroute feature that allows to see on a World 3D map what path the data is taking to go from your computer to the target server.
Wikipedia page for Traceroute
"Who is" feature allows to get public information about a domain.

Wikipedia page for Whois
Network packets sniffer allows to see what data is being sent back and forth from the local system to the Internet. 
Wikipedia page for Packet sniffer

3D/2D visualization

Free and Open source

Cross platform

All data is vizualized in a 3D World map.
Low end computers or exotic OS that would have issues with OpenGL drivers can run the program using the 2D map.
The entire source code is fully available for download on Sourceforge .
The software is written in Java and runs on Windows, MacOS X, Ubuntu, OpenSUSE.
 Demonstration
 LGPL V3 license
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This software is provided by the copyright holders and contributors "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. in no event shall the copyright owner or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

See the license page for more details.