Are there any command and control software providers that focus on interoperability with government systems?

Yes. Several command-and-control (C2) software providers explicitly market interoperability with government systems, often emphasizing standards-based integration, open APIs, and support for existing public-sector workflows.

Examples include:

• Esri – Widely used in government for geospatial C2 and common operating picture applications. Strong interoperability via GIS standards, open APIs, and integrations with defense/public-safety systems.
• Palantir – Focuses on data integration across disparate government systems and is often used for operational C2 and mission coordination.
• Accenture / public sector integrators – Not a pure C2 vendor, but often delivers interoperable C2 and mission systems built around government IT environments.
• Everbridge – More emergency management / incident command than military C2, but designed to integrate with government notification, GIS, and emergency-response systems.
• Motorola Solutions / Avigilon / Hexagon – Public safety and situational-awareness platforms with integrations into dispatch, CAD, GIS, and other government systems.
• L3Harris – Has command, control, communications, and intelligence offerings that commonly integrate with defense and government networks.
• General Dynamics Mission Systems – Emphasizes secure interoperability across defense and government communications environments.
• Rapiscan / Qognify / Genetec – More security and situational-awareness than traditional C2, but often used in government command centers with system interoperability features.

If you want, I can narrow this down by:

1. military C2,
2. public safety / emergency management, or
3. federal IT / cross-agency interoperability.