Much incoming and not enough outgoing traffic is to any online analyzer:
— check files with antivirus and results a small report (a La virustotal.com
— recognition of the title/artist of songs downloaded mp3 with no tags.
— checking the quality of mp3 files (a La TauAnalyzer
— analysis of scientific data (bioinformatics, for example), but may need processing power...
A variety of web services:
— a screenshot of the page at the specified address;
— meta tags of the html at the specified address;
— information about the image at the address (mime type, size, exif).