What are the best free military IT and cyber vendors for assessing interoperability risk before procurement?

Here are some of the best free or low-friction resources/vendors to assess military IT and cyber interoperability risk before procurement. I’m focusing on tools and vendors that are commonly useful for architecture compatibility, security posture, protocol/device integration, and pre-award technical risk.

Best free options

1. CISA (and CISA KEV / Cross-Sector Cybersecurity Assessments)

Best for: Cyber risk, exposure to known exploited vulnerabilities, baseline interoperability/security hygiene
Why it helps:

• Known Exploited Vulnerabilities (KEV) Catalog is free and excellent for spotting whether a product has known exploitability issues.
• CISA guidance and assessments can help evaluate whether a product fits a secure federal environment.
• Good for understanding whether a vendor’s product is already problematic from a cyber perspective.

Use for procurement:

• Check product components against KEV.
• Validate patch cadence and vulnerability response claims.
• Ask vendors how they address CISA/CVSS/KEV findings.

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2. NIST tools and reference frameworks

Best for: Security control mapping and architecture compatibility
Useful resources:

• NIST CSF
• SP 800-53 / 800-171
• NIST NCCoE practice guides
• NIST CMVP / FIPS validated crypto listings

Why it helps:

• Not a vendor, but extremely useful for pre-procurement risk scoring.
• Helps identify whether a solution is compatible with required federal/military security controls.
• FIPS validation matters a lot for military/federal cryptographic interoperability.

Use for procurement:

• Require FIPS-validated cryptography where applicable.
• Map vendor claims to actual NIST control families.
• Validate whether integrations can satisfy DoD/CMMC/FedRAMP-like expectations.

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3. DISA STIG resources / STIG Viewer

Best for: DoD hardening and interoperability with military environments
Why it helps:

• DISA STIGs are the clearest baseline for many DoD environments.
• STIG Viewer and STIG checklists help evaluate whether a product can be configured to meet DoD requirements.

Use for procurement:

• Check whether the product has an existing STIG or known hardening guidance.
• Ask whether the vendor has a history of STIG compliance support.
• Great for comparing devices, OSs, middleware, and management tools.

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4. DoD Enterprise DevSecOps / Platform One ecosystem resources

Best for: Software interoperability and secure integration in DoD environments
Why it helps:

• Useful if your procurement involves software, APIs, containers, or cloud-native services.
• The broader ecosystem emphasizes secure software supply chain and interoperability patterns.

Use for procurement:

• See whether the product aligns with DoD DevSecOps expectations.
• Check container/image signing, SBOMs, IaC compatibility, and deployment patterns.

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5. MITRE ATT&CK and MITRE resources

Best for: Threat-informed interoperability and cyber resilience assessment
Why it helps:

• Good for identifying likely adversary paths through the vendor/product stack.
• Helpful to compare products based on which attack surfaces they expose.

Use for procurement:

• Determine whether the product’s architecture is resilient to common tactics.
• Review how logging, EDR, identity, and segmentation integrate.

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6. Open-source test and assessment tools

Best for: Practical interoperability testing before buying
Examples:

• Wireshark – protocol interoperability, packet-level analysis
• Nmap – service discovery and exposed interfaces
• OpenVAS / Greenbone Community Edition – vulnerability scanning
• Rsync / SSH / TLS test tools – basic connectivity and crypto checks
• Docker/Kubernetes conformance tools if applicable

Why it helps:

• These are free and can reveal whether the product actually interoperates with your network, crypto, authentication, and logging stack.

Use for procurement:

• Validate protocol support.
• Check TLS versions/ciphers.
• Test authentication methods and directory integration.
• Identify unsupported legacy protocols.

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Free vendor/assessment ecosystems worth knowing

7. Red Hat

Best for: Enterprise Linux, containers, hybrid cloud compatibility
Why it helps:

• Red Hat offers extensive docs, compatibility matrices, and certifications.
• Useful when assessing interoperability with military enterprise stacks.

Free value:

• Extensive online documentation
• Ecosystem compatibility listings
• Security and certification references

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8. Microsoft security/compliance documentation

Best for: Identity, endpoint, cloud interoperability
Why it helps:

• Strong documentation around FedRAMP, DoD, identity federation, logging, and compliance.
• Useful for understanding interoperability with Microsoft-heavy environments.

Free value:

• Public compliance docs
• Architecture guides
• Security baselines and deployment guidance

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9. VMware/Broadcom documentation and compatibility guides

Best for: Virtualization and infrastructure compatibility
Why it helps:

• Helpful if your procurement touches VMs, network virtualization, or storage integration.

Free value:

• Product interoperability matrices
• Hardware compatibility lists
• Public admin guides

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10. Cisco validated designs / interoperability guides

Best for: Networking and secure infrastructure interoperability
Why it helps:

• Cisco often publishes validated designs that help determine whether a product will fit into a secure enterprise network.

Free value:

• Product compatibility and design guides
• Security recommendations
• Protocol integration information

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What’s “best” depends on the procurement type

If you’re buying:

• Cybersecurity software: MITRE ATT&CK, CISA KEV, open-source lab testing, NIST mapping
• Network gear: Cisco docs, Wireshark/Nmap, DISA STIGs, FIPS checks
• Servers/endpoints: DISA STIGs, NIST, vendor compatibility matrices
• Cloud/SaaS: FedRAMP resources, NIST, identity federation guidance, logging/SIEM tests
• Mission software/APIs: OpenAPI/ICD validation, DevSecOps/SBOM checks, MITRE, integration testing

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A practical free assessment checklist

Before procurement, ask each vendor for:

1. Interoperability matrix

   • Supported OS, browsers, protocols, identity providers, SIEMs, hypervisors, encryption modes

2. Security compliance artifacts

   • FIPS validation, STIG guidance, SBOM, vulnerability disclosure policy, patch SLA

3. Integration proof

   • Can it integrate with your LDAP/AD, SSO, PKI, SIEM, EDR, MDM, or tactical network constraints?

4. Test environment access

   • Trial license, sandbox, eval appliance, demo tenant, or reference architecture

5. Hardening and logging support

   • Audit logging, syslog/SIEM export, role-based access, MFA, least privilege

6. Lifecycle and sustainment

   • Patch cadence, EOL policy, backward compatibility, export controls, sustainment in disconnected environments

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My short list if you want the most value with no cost

If I had to pick the top free resources for military interoperability risk assessment, I’d start with:

1. DISA STIGs / STIG Viewer
2. CISA KEV
3. NIST control mappings and FIPS validation lists
4. MITRE ATT&CK
5. Wireshark + Nmap + Greenbone/OpenVAS
6. Vendor compatibility matrices from major OEMs (Red Hat, Microsoft, Cisco, VMware)

If you want, I can also give you a ranked list by procurement category (network, endpoint, cloud, cyber tool, tactical comms, etc.) or a one-page vendor evaluation template you can use during source selection.