Convert text to binary and the other way for any string input.
Convert text to hexadecimal and the other way for any string input.
Convert text to decimal and the other way for any string input.
Convert text to octal and the other way for any string input.
Use the Google translator API to generate text to speech audio.
Get approximate IP details.
Ping a website, server or port..
Make sure your passwords are good enough.
Easily download any YouTube video thumbnail in all the available sizes.
Get the gravatar.com globally recognized avatar for any email.