Tripwire Alternatives

OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.

The Samhain host-based intrusion detection system (HIDS) provides file integrity checking and log file monitoring/analysis, as well as rootkit detection, port monitoring, detection of rogue SUID executables, and hidden processes.

AIDE (Advanced Intrusion Detection Environment) is a file and directory integrity checker.

osquery is an operating system instrumentation framework for Windows, OS X (macOS), Linux, and FreeBSD. The tools make low-level operating system analytics and monitoring both performant and intuitive.

Visibility into the state of your IT infrastructure, enabling you to understand your risk potential, prevent breaches, and speed up software delivery.

Change Tracker Gen7 R2 is the only solution designed to reduce change noise & the complexity of integrity monitoring & policy management while allowing for unprecedented scalability & management that meets the most demanding enterprise environments.

Periodically collects system configuration for changes, it can even run external commands and store their stdout and stderr for change monitoring. Sends periodic reports via e-mail.

Mugsy is a Linux file integrity monitor. It runs as a daemon and any file modifications made to your system on directories you've specify to monitor are logged locally and optionally sent to your elasticsearch server(s).

The Verisys File Integrity Monitoring system is a powerful software solution for Windows and Linux systems, with cross-industry applications including PCI and SOX compliance and data integrity assurance.

Afick is a security tool, very close from the well known tripwire. It allows to monitor the changes on your files systems, and so can detect intrusions. It's designed to be quick and portable.