This article presents a summary of the developments in the FactSage thermochemical software and databases over the past six years. FactSage is a comprehensive software package that allows users to access and manipulate compound and solution databases for thermochemical calculations. The software includes modules for information, databases, calculation, and manipulation. The article highlights new databases and developments in calculating and manipulating phase diagrams. The FactSage software has been developed by the CRCT (Centre for Research in Computational Thermochemistry) at École Polytechnique de Montréal, and has been expanded into a fully integrated thermochemical software and database package used worldwide. The software is used in various fields, including chemical and physical metallurgy, chemical engineering, corrosion engineering, inorganic chemistry, geochemistry, ceramics, electrochemistry, and environmental studies. The article discusses various databases, including the FactPS, FToxid, FTsalt, FTmisc, FToxCN, FTfritz, FTlite, FTnucl, FThall, FThelg, and FTpulp databases. These databases contain data for a wide range of compounds and solutions, including oxides, salts, sulfides, alloys, and more. The databases have been extensively revised and updated, with new data added for various systems. The article also discusses the development of the FactSage alloy databases, including FScopp, FSlead, FSstel, and FSupsi. These databases contain data for metallic alloys and are used in various applications, including steelmaking, lead production, and silicon purification. In addition, the article discusses the SGTE databases, including SGPS, SGTE, SGnobl, SGnucl, SGsold, and BINARY. These databases contain data for a wide range of elements and compounds, and are used in various applications, including alloy production, heat treatment, and application of different types of alloys. The article also discusses the documentation and other databases, including SpMCBN, TDmeph, and TDnucl. These databases are used in various applications, including nuclear industry, high-temperature materials, and nuclear fuels. The article highlights the various modules of FactSage, including the Equilib module, which is used for calculating thermodynamic equilibria and phase diagrams. The article also discusses the FactOptimal module, which is used for optimizing alloy and process design. The article concludes with a discussion of the various phase diagram modules, including the Phase Diagram module, which is used for plotting thermodynamic properties on the X- and Y-axes. The article also discusses various types of phase diagrams, including gas polythermal projections, enthalpy-composition diagrams, reciprocal diagrams, volume diagrams, first-melting projection diagrams, and paraequilibrium phase diagrams.This article presents a summary of the developments in the FactSage thermochemical software and databases over the past six years. FactSage is a comprehensive software package that allows users to access and manipulate compound and solution databases for thermochemical calculations. The software includes modules for information, databases, calculation, and manipulation. The article highlights new databases and developments in calculating and manipulating phase diagrams. The FactSage software has been developed by the CRCT (Centre for Research in Computational Thermochemistry) at École Polytechnique de Montréal, and has been expanded into a fully integrated thermochemical software and database package used worldwide. The software is used in various fields, including chemical and physical metallurgy, chemical engineering, corrosion engineering, inorganic chemistry, geochemistry, ceramics, electrochemistry, and environmental studies. The article discusses various databases, including the FactPS, FToxid, FTsalt, FTmisc, FToxCN, FTfritz, FTlite, FTnucl, FThall, FThelg, and FTpulp databases. These databases contain data for a wide range of compounds and solutions, including oxides, salts, sulfides, alloys, and more. The databases have been extensively revised and updated, with new data added for various systems. The article also discusses the development of the FactSage alloy databases, including FScopp, FSlead, FSstel, and FSupsi. These databases contain data for metallic alloys and are used in various applications, including steelmaking, lead production, and silicon purification. In addition, the article discusses the SGTE databases, including SGPS, SGTE, SGnobl, SGnucl, SGsold, and BINARY. These databases contain data for a wide range of elements and compounds, and are used in various applications, including alloy production, heat treatment, and application of different types of alloys. The article also discusses the documentation and other databases, including SpMCBN, TDmeph, and TDnucl. These databases are used in various applications, including nuclear industry, high-temperature materials, and nuclear fuels. The article highlights the various modules of FactSage, including the Equilib module, which is used for calculating thermodynamic equilibria and phase diagrams. The article also discusses the FactOptimal module, which is used for optimizing alloy and process design. The article concludes with a discussion of the various phase diagram modules, including the Phase Diagram module, which is used for plotting thermodynamic properties on the X- and Y-axes. The article also discusses various types of phase diagrams, including gas polythermal projections, enthalpy-composition diagrams, reciprocal diagrams, volume diagrams, first-melting projection diagrams, and paraequilibrium phase diagrams.