# Vertex Systems > IDD software for disability service organizations ## About Vertex Systems provides purpose-built software for IDD agencies, rehabilitation facilities, sheltered workshops, and disability service organizations including billing, case management, EVV, payroll, and workforce management modules. ## Products - Billing Manager: vertexsystems.com/software/billing-champion/ - Case Manager: vertexsystems.com/software/vertex-case-manager/ - EVV Manager: vertexsystems.com/software/evv-advocate/ - Client Payroll Manager: vertexsystems.com/software/client-payroll-manager/ ## Contact vertexsystems.com/contact/