Veterinary epidemiology: software for sampling and surveys
BDFree1 (sample size calculation to estimate disease freedom, using Bayesian methodology) http://www.epi.ucdavis.edu/diagnostictests/software.html
CSurvey 2.0 (Cluster surveys) http://www.ph.ucla.edu/epi/csurvey.html
FreeCalc (Epidemiological calculator for planning and analysis of surveys to detect disease or prove freedom from disease. Calculates sample size requirements based on diagnostic test sensitivity and specificity, taking population size into account, and analyses the results of such surveys) http://www.ausvet.com.au/content.php?page=software#freecalc
G Power (Statistical power analyses for the most common statistical tests t-tests; post hoc, a priori and compromise power analyses) http://www.psycho.uni-duesseldorf.de/abteilungen/aap/gpower3/
Herdacc [NOTE DIRECT LINK TO PROGRAM] (Program for calculating herd (aggregate) sensitivity and specificity for a wide range of values of individual level sensitivity and specificity) http://www.vetschools.co.uk/EpiVetNet/files/herdacc.exe
PS (Interactive program for performing power and sample size calculations. It can be used for studies with dichotomous, continuous, or survival response measures. The alternative hypothesis of interest may be specified either in terms of differing response rates, means, or survival times, or in terms of relative risks or odds ratios) http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/PowerSampleSize
SampleXS (Sample size calculator for cross-sectional surveys using simple random, systematic, or more complex sampling strategies) http://www.brixtonhealth.com/samplexs.html
Survey Toolbox (Suite of software programs which are designed to make planning, conducting and analysing statistically valid, efficient and practical animal health surveys easier) http://www.ausvet.com.au/content.php?page=software#st
VPLX (Calculation of variances for complex sample designs through replication) http://www.census.gov/sdms/www/vwelcome.html
WinEpiscope (Software for sample size estimation, evaluation of diagnostic tests, cross-tabulation of data from various types of epidemiological studies, Reed-Frost simulation models etc…) http://www.clive.ed.ac.uk/cliveCatalogueItem.asp?id=B6BC9009-C10F-4393-A22D-48F436516AC4