E2guardian is a web content filter that can work in proxy, transparent or icap server modes

An ICAP Server with yara scanner for URL and content.

ICAP server framework for node.js - create custom HTTP proxy filters for Squid, etc.

An implementation of the ICAP server part in pure Ruby

MetaDefender ICAP Server iApp template

Node-RED nodes for implementing an ICAP server

Peer to peer security policy enforcement system for web application

ICAP service which unpacks password-protected attachments (.iso, .rar, .7z, .zip etc.) of various file types and scans them using YARA. Can be seamlessly integrated into rspamd.