The primary feature of GDA, short for Genetic Data Analysis, is that it implements the analysis of variance based estimators of Wright's F-statistics advocated by Weir and Cockerham (1984) and Weir (1996) and uses randomization procedures to construct confidence limits about the estimates (see also Fstat and TFPGA). In addition, it calculates basic descriptive statistics, and implements test of linkage disequilibrium. Nice user interface but peculiar input data formatting. Available for Windows. There is a command-line-only version available for Mac OS 10.2.8 and 10.3 (Jaguar and Panther).