Ecopath – a static, mass-balanced snapshot of the system
Ecosim – a time dynamic simulation module for policy exploration
Ecospace – a spatial and temporal dynamic module designed for exploring the combined impacts of fishing, the placement of protected areas, and changing environmental conditions.
However, in his paper titled “The fundamental equations of ECOPATH and its variants” published in the Far East Journal of Applied Mathematics, Volume 102, Number 2, 2019, Pages 101-129, Xiao (2019) derived the fundamental equations of ECOPATH and its variants as a system of ordinary or partial differential-integral equations, subject to appropriate initial and boundary conditions, and examine the logical consistency in parameterizing their fishing mortality and utilized production, and the mathematical and biological validity in deriving their fundamental equations. He showed that the logically consistent fundamental equations of ECOPATH and its variants are not consistent with the basic equations of the currently used ECOPATH and its variants, thereby highlighting a need to revise all past work on ECOPATH and its variants.
The desktop version of Ecopath with Ecosim runs only on Windows and requires Microsoft Access database drivers version 2007 or newer. The computational core of Ecopath with Ecosim can be executed on other operating systems such as Unix or Linux using the Mono common language runtime. Spin-off versions in R, Matlab and Fortran are developed independently of the main desktop version of EwE, and are not supported by the Ecopath Research and Development Consortium. 
^NOAA, 2007. ECOPATH Modeling: Precursor to an Ecosystem Approach to Fisheries Management [WWW Document]. URL [celebrating200years.noaa.gov] (accessed 8.26.12).
^Smikle, S.G., V. Christensen and K.A. Aiken (2010). "A review of caribbean ecosystems and fishery resources using ECOPATH models". Revue Etudes Caribéennes, n°15, [etudescaribeennes.revues.org]
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^Walters, C., Pauly, D. and Christensen, V., 1999. Ecospace: Prediction of mesoscale spatial patterns in trophic relationships of exploited ecosystems, with emphasis on the impacts of marine protected areas. Ecosystems, 2:539-554.
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^Walters, C.J., Christensen, V., Martell, S.J. and Kitchell, J.F., 2005. Possible ecosystem impacts of applying MSY policies from single-species assessment. ICES J Mar Sci, 62:558-568.
^Christensen, V. and Walters, C.J., 2004. Trade-offs in ecosystem-scale optimization of fisheries management policies. Bull Mar Sci, 74:549-562
^Christensen, V. and Booth, S., 2006. Ecosystem modeling of dioxin distribution patterns in the marine environment. Chapter 6. In: J. Alder and D. Pauly (Editor), On the multiple uses of small pelagic fishes: from ecosystems to markets. UBC Fisheries Centre Research Reports 14(3). Fisheries Centre, University of British Columbia [ISSN 1198-6727], Vancouver
^Guénette, Sylvie; Heymans, Sheila JJ; Christensen, Villy; Trites, Andrew W (2006). "Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska". Canadian Journal of Fisheries and Aquatic Sciences. 63 (11): 2495–2517. doi:10.1139/f06-136. ISSN0706-652X.
^Christensen, Villy; Coll, Marta; Steenbeek, Jeroen; Buszowski, Joe; Chagaris, Dave; Walters, Carl J. (2014). "Representing Variable Habitat Quality in a Spatial Food Web Model". Ecosystems. 17 (8): 1397–1412. doi:10.1007/s10021-014-9803-3. ISSN1432-9840.
^Steenbeek, Jeroen; Coll, Marta; Gurney, Leigh; Mélin, Frédéric; Hoepffner, Nicolas; Buszowski, Joe; Christensen, Villy (2013). "Bridging the gap between ecosystem modeling tools and geographic information systems: Driving a food web model with external spatial–temporal data". Ecological Modelling. 263: 139–151. doi:10.1016/j.ecolmodel.2013.04.027. ISSN0304-3800.
^Christensen, V. and Lai, S., 2007. Ecopath with Ecosim 6: the sequel. The Sea Around Us Project Newsletter, 43:1-4 (September–October).
^Steenbeek, Jeroen; Buszowski, Joe; Christensen, Villy; Akoglu, Ekin; Aydin, Kerim; Ellis, Nick; Felinto, Dalai; Guitton, Jerome; Lucey, Sean; Kearney, Kelly; Mackinson, Steven; Pan, Mike; Platts, Mark; Walters, Carl (January 2016). "Ecopath with Ecosim as a model-building toolbox: Source code capabilities, extensions, and variations". Ecological Modelling. 319: 178–189. doi:10.1016/j.ecolmodel.2015.06.031.