VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware. You can upload files up to 150 MB in size.
Jottis malware scan is a free online service that enables you to scan suspicious files with several anti-virus programs. Scanners used are Linux versions; detection differences with Windows versions of the same scanners may occur due to implementation differences.
Joe Sandbox detects and analyzes potential malicious files and URLs on Windows, Android, Mac OS, Linux, and iOS for suspicious activities. It performs deep malware analysis and generates comprehensive and detailed analysis reports.
MetaDefender Cloud helps organizations build a long-term strategy and processes for critical infrastructure protection, providing the tools to prevent not only cyberattacks but also the correlated consequences.
Security Plus is a browser extension powered by VirusTotal's API, which provides free checking of URLs for viruses. It uses up to 64 different antivirus products/scan engines to check for viruses that the user's own antivirus solution may have missed.
Virusade is a hosted virus scanning utility designed for integration with web applications. Any application dealing with user-supplied files should be scanning for viruses, and virusade makes it easy with an HTTP REST/JSON approach. Commercial use is allowed.