Open source cybersecurity software gives teams full code access, no per-user licensing, and the freedom to self-host, but operational cost replaces license cost. These are the open source options in this category, followed by the full list for comparison.
No product in this category matches the open source filter yet, so all 15 are listed below.
Back to all Cybersecurity Software tools, or browse the full software directory. You can also run head-to-head comparisons or read about our review methodology.
For background on scoring, see how rankings work. Our editorial articles add deeper analysis, the glossary clarifies vendor terminology, and our calculators help estimate ROI before the shortlist narrows further.
Nothing in this category met the open source filter, so the full cybersecurity software category is listed here instead.
Custom quote · Cloud / On-prem · Free trial
Two deployment paths, cloud-managed and on-prem, sit under the same layered endpoint protection: anti-exploit, behavioral detection, and EDR offered as an option. The complication is tiering, because Bitdefender's SMB and enterprise editions are meaningfully different products. Pinning down which tier matches the environment and its compliance requirements is the first thing worth settling.
Custom quote · Cloud
Detection and response run from the cloud through a single lightweight agent. Threat intelligence is drawn in real time from CrowdStrike's global sensor network. The Threat Intelligence integration then attaches adversary context to an alert, which matters for security teams that need to know who is behind an intrusion as well as what it touched. Commercial terms are quoted per engagement.
Custom quote · Cloud
Prevention decisions are made by an AI model on the endpoint with no cloud lookup, which keeps CylancePROTECT functional on disconnected and air-gapped devices. Now under BlackBerry, the predictive approach to malware prevention has stayed in place. Response capabilities added alongside it narrow the gap to full EDR platforms, and the vendor prices it on a quoted basis.
Custom quote · Cloud / On-prem · Free trial
ESET Protect layers antivirus, web control, full-disk encryption, and an optional EDR module. The management console runs on-prem or in the cloud, and Windows, macOS, and Linux endpoints report into the same place. The interface stays consistent between the SMB and enterprise tiers. For an organization that wants to stay on one platform as headcount grows, that consistency is the practical argument.
subscription
Endpoint security agent with VPN, vulnerability scanning, and web filtering integrated with FortiGate.
subscription
Endpoint protection platform with ML-based threat detection, encryption, and vulnerability management.
Per-endpoint · Cloud · Free trial
Threat detection, EDR and DNS filtering are available by tier under the ThreatDown name, which Malwarebytes Business was renamed to. Teams in the SMB and mid-market bracket who find enterprise endpoint protection software oversized treat it as a capable alternative with lower operational overhead and a per-endpoint price that is easy to scope.
Custom quote · Cloud
Defender for Endpoint reports into the same portal as the rest of Microsoft's security stack, with native ties to Microsoft 365 and Entra ID. Organizations licensed for Microsoft 365 E5 frequently have it already. The open question is operational maturity, meaning whether the team can configure the platform and act on what it surfaces.
Custom quote · Cloud
The autonomous response in SentinelOne Singularity will isolate and remediate a threat with no analyst involved, which is the point for enterprise teams whose SOC bandwidth is the limiting factor. Organizations that want a human to review before remediation runs have a different question to answer. For them, how far those autonomous settings can be tuned toward their own risk tolerance decides the fit.
Custom quote · Cloud · Free trial
Deep learning detection and the CryptoGuard ransomware component do the prevention work, with managed detection and response available on top as an optional service. SMB and enterprise tiers come from the same vendor, which suits organizations that would sooner grow into a bigger tier than migrate endpoint protection software at mid-market scale.
Custom quote · Cloud
Prevention, detection and response are all covered, and the history in large Windows estates is a long one. Broadcom now owns the product. Existing Symantec licensing is usually the reason it stays, folded into a broader Broadcom agreement. Teams evaluating it fresh generally find the onboarding process more involved than cloud-native endpoint protection software.
Custom quote · Cloud / On-prem
Trellix came out of the merger of McAfee Enterprise and FireEye. Its endpoint security line targets large Windows environments carrying compliance requirements. Much of the current buying interest comes from organizations holding McAfee or FireEye licensing and working out a transition path. Pricing across the consolidated portfolio is handled by quote.
Custom quote · Cloud / On-prem
Cross-generational detection here means signature-based, behavioral and machine learning techniques working together rather than in isolation. Estates that mix Windows and macOS are the typical setting, with mid-market and enterprise buyers weighing Apex One when they want a single vendor for protection and a clear progression from antivirus into full EDR, deployed cloud or on-prem.
Custom quote · Cloud
Organizations with significant VMware infrastructure are the natural evaluators, usually for workload protection inside virtualized environments. Endpoint protection and EDR are delivered from the cloud and integrated with the vSphere security ecosystem. Broadcom's acquisition has left some uncertainty about long-term product packaging.
subscription
Cloud-based endpoint security with real-time threat intelligence and lightweight agent architecture.
The license is free, but hosting, maintenance, patching, and upgrades replace the vendor's license fee. Teams without dedicated ops resources often spend more on self-managed open source than on a managed commercial alternative.
Open source is strongest when you need full code control, on-premises deployment for compliance, or want to avoid vendor lock-in. It is weaker when your team lacks the ops capacity to maintain, patch, and scale the deployment.
Check community activity (commits, issues, and releases in the last six months), commercial support options, documentation quality, and the total operational burden against a managed alternative. A dormant project with no commercial backing is a risk.
