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Metadefender, by OPSWAT, allows you to quickly multi-scan your files for malware using 43 antivirus engines!

VirSCAN.org is a FREE on-line scan service, which checks uploaded files for malware, using antivirus engines, indicated in the VirSCAN list. On uploading files you want to be checked, you can see the result of scanning and how dangerous and harmful/harmless for your computer those files are.

Joebox is an extensive runtime analysis system. It is designed for automatic runtime analysis of malware and other software on Windows based operating systems. You can search Joe Sandbox hashes and reports online via any search engine but subscription is needed to upload custom files for analysis.

Once the file is submitted, COMODO Automated Analysis System will scan it and report back its findings.

Online heuristic URL scanning and malware detection. Scan websites for malware, exploits and other infections with quttera detection engine to check if the site is safe to browse. Check website for malicious pages and online threats. Monitor websites/domains for web threats online. Security tools for webmasters.

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.