Take an IP and try to look for the domain/host associated with it.
Get approximate IP details.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Generate passwords with custom length and custom settings.
Minify your CSS by removing all the unnecessary characters.
Transform an image input to a Base64 string.
Compress and optimize images for a smaller image size but still high quality.