Yes, there are open-source tools that can detect unusual login activity:
OSSEC: A Host-based Intrusion Detection System (HIDS) that monitors and alerts on unusual login activity.
Suricata: A Network Intrusion Detection System (NIDS) that can detect and alert on unusual login activity.
AIDE: A file integrity monitoring tool that can detect and alert on changes to login-related files.
Snort: A Network Intrusion Prevention System (NIPS) that can detect and alert on unusual login activity.
SELinux: A mandatory access control (MAC) system for Linux that can restrict and log unusual login activity.
These are just a few examples of open-source tools that can be used to detect unusual login activity. It's important to choose a solution that fits your organization's specific security needs and to thoroughly test and evaluate it before deploying it.
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