Focused crawls are collections of frequently-updated webcrawl data from narrow (as opposed to broad or wide) web crawls, often focused on a single domain or subdomain.
OSSEC is an Open Source Host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.
Some of my security-related coding projects for OpenBSD: A kernel-based user-profile intrusion detection system (FUPIDS) and an ICMP-based "port-knocking" service (openportd).
Lightweight file integrity based - Host Intrusion Detection System (HIDS) built in pure Python3. Recursively enumerates directories, stores hashes of files, detects and logs file modifications.
An incomplete final project for CSS 517: Incident Response and Recovery. Designed as a host-based intrusion detection system on Android using a logistic regression model generated by Weka.