CarrierWave - Solution for file uploads for Rails, Sinatra and other Ruby web frameworks.
Imperva Cloud Application Security - Deploy your applications and data where you want. When you want. Imperva keeps them secure in the cloud, on premises, and in hybrid clouds.
tus.io - File Uploads
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Uppy - The next open source file uploader for web browsers
Incapsula - Incapsula is a Security CDN that makes any website safer, faster and more reliable. 5 minute setup will make a world of difference.