Length Frequency Distribution Analysis (LFDA) and Catch and Effort Data Analysis (CEDA) are software packages with analytical tools to guide and assist stock assessment and develop fisheries management policies in developing countries. The outputs of LFDA include estimates of growth and mortality and precautionary management advice. CEDA analyses catch and effort data to provide estimates of current and unexploited stock biomass, as well as other parameters of fish population dynamics. Results provide managers with estimates of the potential yield of fish stocks, taking account of uncertainty and variable recruitment. The software packages are available in a Windows-standard user-interface.