Top 10 Free and Open-Source SIEM Software

SIEM Software

Successful SIEM strategies are an investment, and sometimes expensive. SIEM management is a time-consuming process that requires constant evaluations and adjustments in order to achieve and maintain optimal performance. This is why SIEM solutions are essential. It can make you vulnerable to attacks. in this blog, we read the top free open-source SIEM software.

The solution may be open-source SIEM or free SIEM software. The public can modify open-source SIEM tools and those that are the most effective have loyal fans. Open-source SIEM codes are constantly being improved by IT professionals from all over the world. This flexibility and customizability could prove useful for admins with the resources and time to adjust open-source tools.

This list contains my top open-source and free SIEM tools to help you make a decision between the many available. A few paid tools are also included in the list, which offers free trials. The free tools are not capable of providing an enterprise-level SIEM solution. SunWinds (r), Security & Event Manager (SEM ) is the best SIEM tool and offers a free trial. First, let me give you a brief overview of SIEM’s main features and functions.

What to Know About Free and Open-Source SIEM Solutions

Open-source tools can be difficult to use. Open-source programs are often less user-friendly than paid versions. These programs can be more time-consuming and require more effort to maintain. Open-source SIEM software tends to be too labor-intensive for full-fledged IT departments. Therefore, most users migrate to enterprise-grade tools. Open-source tools do not offer customer service. You can’t call the number and get an answer to your questions.

SolarWinds Security Events Manager

Although SolarWinds Security Event Manager is not free or open-source, it does offer a free 30-day trial. This list has been selected because it’s an obvious choice for enterprise-level needs. It has all the features and functions mentioned above and dynamic data visualization with a variety of charts and graphs. It is easy to use, clean, and colorful. This SIEM tool supports HIPAA and SOX. It also supports PCI DSS.

SEM has many useful features that show how much thought was put into its design and ease of use. For instance, it has out-of-the-box functionality. This makes it easy to get started, even if you aren’t yet convinced to use a paid tool. You can be sure that you won’t lose money or take up too much time.

SEM is highly automated. It blocks hundreds of different threat types automatically and features an alerts system that keeps you up-to-date on threats and advanced search utilities that make it easier to navigate your logs faster. The program is available 24/7, so it’s impossible for suspicious events to sneak through. It responds immediately and has audit-proven reports and virtual appliance deployment.

SEM is also a cost-effective reason why I have given it a priority on this list. This SIEM tool offers incredible value for money because it is priced based on the log-emitting sources rather than log volume. SEM’s Free Trial is a cost-effective, highly-technical, and simple-to-use solution for enterprise-grade applications.

Top 10 Free and Open-Source SIEM Tools and Software


AlienVault’s OSSIM is an open-source SIEM tool. It is packed with many features, including event collection, normalization, correlation utilities, and more. It offers short-term monitoring and logging capabilities as well as long-term threat assessment, built-in automated response, data analysis, and data archiving.

There are many reasons why OSSIM is a good choice, including valuable tools such as asset discovery and behavioral monitoring. Contribute and get real-time information about malicious hosts. This helps to ensure security is a top priority. This free SIEM tool has a few drawbacks. It is time-consuming to set up the program, especially for Windows. Customizing it to your requirements requires a significant time investment.


OSSEC is a strong option among the many free SIEM software options. This program is a popular open-source intrusion prevention solution. It is used by many Solaris, macOS, Linux, BSD, Solaris, and Solaris users. This program has both server-agent as well as serverless modes. The log analysis utilities cover many sources, including FTP and mail servers.

OSSEC can be used to monitor multiple networks from a single location. OSSEC’s community is well-organized and supportive. It is easy to join the mailing list and the Slack channel. This makes it easier to collaborate with other users. This tool can sometimes be disruptive due to software updates.

3. Sagan

Sagan, a SIEM tool that provides real-time log analysis as well as correlation, is available for free. It can also be used for log normalization and script execution upon event detection, real-time alerting, multiline log support, and automatic firewall monitoring. It is lightweight and multi-threaded, which allows it to use all CPUs/cores to log processing in real-time. It is compatible with many graphic security consoles such as EveBox, Snorby, and BASE. Sagan’s main drawback is its inability to be used easily.

4. Splunk

Splunk Free is, as the name implies, a free version of Splunk. You can index up to 500MB per day with this free SIEM software. The limit is the maximum amount of data you are allowed to add. This system has the advantage of allowing you to add 500 MB each day for as long as you like. You could end up with multiple terabytes. Enterprise is required if you plan to upload more than 500 MB per day.

Splunk Enterprise provides real-time visibility and allows you to automate data collection, indexing, and alerting. With AI and machine learning, your solution will become more intelligent every day. Splunk Enterprise can be used as a SIEM program. Splunk Free has many of the same features as Splunk Enterprise, but it’s not a long-term solution. Splunk Free doesn’t include indexer clustering or alerting as Enterprise utilities.

5. Snort

This open-source, free intrusion detection tool offers many sophisticated features. This open-source intrusion detection tool can monitor network traffic in real-time, provide log analysis utilities and display traffic. The tool is supported online by Snort resources.

Official documentation includes a Snort FAQ file and a Snort user guide. It also contains instructions on how to locate and use your Oinkcode. This tool is not recommended for IT professionals with extensive IT skills, despite the fact that it contains many useful resources. Snort is not a complete SIEM solution.

6. Elasticsearch

Elasticsearch is basically a search and analytics engine. It centrally stores your data and allows you to query it using any combination of search types (geo. metric. structured. unstructured). This tool allows you to zoom in and out on large volumes of log lines. You can see both the big picture as well as the details. This tool doesn’t provide any alert functionality and is not great for correlating.

7. MozDef

MozDef is a highly scalable and resilient tool that I have included in this list. It is an open source SIEM solution that uses a microservices-based architecture. It can integrate with any third parties and offers event correlation as well as security alerts to keep users informed. MozDef was developed by Mozilla. It’s a powerful SIEM tool that can be integrated with any third party. However, it takes time to set it up and learn how to use it.

8. ELK Stack

Elastic Stack (also known as ELK) is a collection of free SIEM tools. Elasticsearch is a distributed, JSON-based search engine and analytics engine. It has been previously mentioned in this guide. Kibana is another tool in the Elastic Stack. Beats is responsible for lightweight shippers sending data to edge machines. Logstash collects data.

These tools offer a better SIEM solution than Elasticsearch by themselves. This suite of tools is quite impressive. Elasticsearch, however, is the core of the suite and provides the most prominent of the stack’s utilities.

9. Wazuh

Wazuh is a free SIEM that prioritizes threat detection, incident response, and integrity monitoring. Although it is not free, a cloud-based version of Wazuh is available. This tool is versatile with cloud security, containers security, log analysis, and intrusion detection. However, it is not as powerful as other options.

10. Apache Metron

Apache Metron is an open source SIEM tool that combines multiple open-source SIEM solutions in one centralized console. Apache Metron includes six components: SOC analyst and SOC investigator, SOC managers, forensic investigators, security platform engineers, and security data scientists. Although the platform is visually and dynamic, it could be easier to use.

SIEM Functionality and Features

SIEM (also known as Security Information and Event Management) is an essential element of cybersecurity. SIEM software offers the tools required to effectively log management and event correlation, threat intelligence gathering and incident management, compliance standard fulfillment, vulnerability assessment, and compliance standard fulfillment.

Different SIEM tools will prioritize different features and functionalities. Before you choose the SIEM tool that you want to use, it is important to understand the basics of SIEM. You should be aware of the following features, regardless of whether you choose to use a paid or open-source SIEM software:

  • Intrusion Detection: It is crucial to have an effective intrusion detection strategy. Your tool must be able to distinguish between innocent failed login attempts and system-wide attacks. It is important to have near-real-time data analytics.
  • Automatic Notifications and Alerts: SIEM solutions will alert you when an unusual, concerning event, occurs.
  • Events Logging: Events logging allows you to detect unusual activity in real-time and allows you to investigate all issues.
  • AI/Intelligent Threat Detection: A SIEM solution that is successful should be able to predict potential threats. This requires information about the most recent threats to be compared with archival data as well as current threats.
  • Data Storage & Filtering: Information should be kept in an archive so that it can be referred back to when needed. This will allow for future threat detection and resolution. You should be able to search for certain information and filter it quickly.
  • Visualization: Data visualization is a great tool for data interpretation. With just a glance, graphs, dials, and color-coding give you an overview of the system.
  • Compliance: It’s always a good idea to have SIEM software in order to help ensure regulatory compliance.
  • Compatibility: SIEM software must be compatible with your network so that it can provide a complete view of all your events.

Conclusion – SIEM Tools

This list of free open-source SIEM software should help you decide which one is right for you. OSSIM is the most popular open-source SIEM tool. However, if you are looking for an enterprise-grade solution, none of these open-source and free programs will do. SolarWinds is a cost-effective, flexible, and powerful enterprise-grade solution. I can’t praise it enough. The program’s sophistication is worth the investment.

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