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

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.

MetaDefender ICAP Server iApp template

Peer to peer security policy enforcement system for web application

Node-RED nodes for implementing an ICAP server