CCleaner is a system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!

Wireshark is the world's most popular network protocol analyzer. It is used for troubleshooting, analysis, development, and education. Wireshark development thrives thanks to the contributions of networking experts across the globe. It is the continuation of a project that started in 1998. Deep inspection of hundreds of protocols, with more being added all the time. Live capture and offline analysis. Standard three-pane packet browser.