Top 10 Open-Source Cloud Security Tools to Strengthen Your Cloud Infrastructure

Data shows that 83% of enterprises save costs and boost efficiency by moving to the cloud, but cloud‑security challenges follow. The following open‑source tools are suitable for SaaS, PaaS, and IaaS cloud service models.

1. Wazuh

Wazuh is an integrated SIEM, HIDS, and XDR platform. It is rapidly growing in the open‑source community, with over 200,000 enterprise users, including Fortune 100 companies. It supports both on‑premises and cloud deployments, offering flexible, highly scalable infrastructure.

Link: https://wazuh.com/

2. Osquery

Osquery is an open‑source operating‑system monitoring and analytics tool that lets you query system metrics using SQL‑like statements. It works on Windows, macOS, Linux, and FreeBSD, helping improve system performance by exposing processes, network connections, hardware events, and browser plugins.

Created by Facebook in 2014, Osquery can capture unknown malware indicators, though it requires separate deployment and manual threat handling.

Link: https://github.com/osquery/osquery

3. GoAudit

GoAudit is a Linux audit system that combines kernel source monitoring with system‑call tracing. Released in 2016, it features multi‑line log recording and JSON‑blob analysis, allowing users to invoke the kernel via Netlink and implement custom threat‑filtering logic.

Link: https://github.com/slackhq/go-audit

4. Grapl

Grapl, launched in March 2022, is a graph‑based security detection, incident response, and forensics platform. It ingests security logs, transforms them into sub‑graphs, and merges them into a master graph to reconstruct attack sequences, enabling automated defensive actions when suspicious patterns appear.

Link: https://github.com/grapl-security/grapl

5. OSSEC

OSSEC, released in 2004, is a security detection and monitoring platform used for log analysis, web‑server and firewall inspection, and real‑time integrity monitoring. It supports Windows, Linux, OpenBSD, FreeBSD, Solaris, and other environments, with a centralized manager that aggregates agent data.

Link: https://github.com/ossec/ossec-hids

6. Suricata

Suricata provides intrusion detection, intrusion prevention, and network monitoring. Since its 2009 release, it can monitor high‑throughput traffic (up to 10 Gbps), extract files, and be deployed on bare‑metal or virtual servers in AWS to detect advanced threats.

Link: https://github.com/OISF/suricata

7. Zeek/Bro

Zeek (formerly Bro) is a traffic‑analysis tool that identifies anomalous behavior and suspicious activity, differing from traditional rule‑based IDS. It lets users inspect pre‑ and post‑attack activity and offers a programmable language for building complex detection logic.

Link: https://zeek.org/

8. Panther

Panther, open‑sourced by Airbnb, automates security detection to address SIEM shortcomings. It creates transparent, user‑specific detection rules, reduces false positives, automatically repairs misconfigurations, and stores critical data securely. Panther is deployed on AWS using CloudFormation.

Link: https://github.com/panther-labs/panther-analysis

9. Kali Linux

Kali Linux is a Debian‑based distribution focused on penetration testing and security auditing. It provides a wide range of hacking tools, runs on many devices (Raspberry Pi, Odroid, Chromebooks, etc.), and can execute Linux binaries on Windows 10 via WSL.

Link: https://www.kali.org

10. PacBot

PacBot (Policy as Code Bot) is a compliance monitoring and cloud‑security automation tool. It scans resources against defined policies, offers an automatic remediation framework, and provides visual dashboards for compliance status, simplifying analysis and response to policy violations.

Link: https://github.com/tmobile/pacbot

Reference: https://cybersecuritynews.com/opensource-cloud-security-tools/