The top public health surveillance systems include DHIS2, SORMAS, ESSENCE/BioSense, Epi Info, Go.Data, REDCap, ArcGIS for Health, HealthMap, CommCare, and Epic Cosmos. DHIS2 is the most widely used national-scale surveillance platform because it supports real-time health data collection, outbreak tracking, analytics, interoperability, and cloud deployment for governments and NGOs. SORMAS and Go.Data are highly preferred for infectious disease surveillance, contact tracing, and outbreak management, especially during epidemics and emergency responses. ESSENCE/BioSense is widely used for syndromic surveillance and early outbreak detection with strong AI-driven analytics and hospital integration. Epi Info and REDCap are popular in research institutions for epidemiological analysis, reporting, and survey management. ArcGIS for Health specializes in geospatial disease monitoring and mapping, while HealthMap focuses on global real-time outbreak intelligence using AI and multiple public data sources. CommCare is widely used in frontline healthcare and mobile-based field data collection, whereas Epic Cosmos supports large-scale healthcare analytics using hospital and clinical data integration. Overall, DHIS2 and ESSENCE are best for government and national health systems, SORMAS and Go.Data suit outbreak response teams, and Epi Info or REDCap are ideal for public health research and academic institutions.