Not every network security software evaluation starts with budget approval. The products below offer free tiers, free plans, or community editions, which gives IT teams a real way to test capabilities before paying for a license. The full category follows for context.
1 of 11 products in this category match the free access filter and are highlighted below.
Back to all Network Security 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.
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.
The rest of the network security software category, listed because the free access filter above did not select them. Worth reading when the highlighted options do not fit.
subscription
Enterprise network security platform with firewall, threat prevention, and unified security management.
subscription
Next-generation firewall with integrated IPS, malware defense, and URL filtering for network edges.
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.
subscription
Network firewall appliance with integrated IPS, VPN, SD-WAN, and AI-driven threat detection.
subscription
Next-generation firewall and network security platform with threat prevention, URL filtering, and zero-trust enforcement.
open-source
Open-source firewall and router platform based on FreeBSD with enterprise-grade VPN and traffic shaping.
open-source
Open-source network intrusion detection and prevention system with real-time traffic analysis.
subscription
Synchronized security firewall with deep packet inspection, web filtering, and lateral movement protection.
open-source
High-performance open-source IDS/IPS and network security monitoring engine with multi-threaded processing.
Custom quote · Cloud
Identity and context decide access, application by application, so users never get a route to a full network segment the way legacy VPN hands them one. Delivery runs from Zscaler's global cloud infrastructure under a custom quote. Enterprise organizations retiring older remote access infrastructure typically evaluate it next to Cloudflare One and Palo Alto Prisma Access.
Some free tiers are production-capable for small teams, but most limit features such as reporting, automation, or multi-tenancy. Evaluate the free version against your actual workflow before assuming it will scale.
Common limits include endpoint or user caps, restricted integrations, basic reporting, no SLA-backed support, and missing enterprise features such as SSO, RBAC, or audit logging. Check what triggers the upgrade.
Focus on the constraints that matter in your environment: device limits, OS coverage, automation depth, and what happens when you hit the free tier ceiling. A free product that forces a full migration at scale costs more than starting with affordable paid software.
