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If your work involves chemistry of natural or industrial aquatic systems, hydrology, bio-geochemistry, performance and/or safety assessment of waste barriers, environmental sciences, nuclear engineering, groundwater pollution, corrosion, radio-toxicology,... then CHESS and JCHESS may be of interest to you.

CHESS is a speciation model specifically developed to simulate the equilibrium state of complex aquatic systems, including oxides or minerals, organics, colloids and gases. CHESS stands for Chemical Equilibrium of Species and Surfaces and is actually used in many scientific areas, notably in environmental engineering, safety and performance assessment of waste repositories and ground- and surface water pollution studies. About seven different thermodynamic databases have been made available for use with CHESS and they are readily extended with new species.

Designed to meet demands of the most complex chemical modelling needs, yet CHESS aims to meet requirements of modern user-friendliness. The availability of JCHESS, a graphic user's interface to CHESS, greatly facilitates the use and brings even complex options in reach of all modelling scientists and engineers. JCHESS is available for Windows, Mac OS X, Linux and Solaris.

Read more or take a look at some screenshots.

JCHESS 2.0 released!
On April 1st 2002, we released version 2.0 of JCHESS. This version includes many new options, such as very simple and effective interface to building activity (Pourbaix) and Piper diagrams. JCHESS 2.0 is based on CHESS 3.0, the latest stable release of CHESS. Read more or take a look at some screenshots.

CHESS 3.0 available for free download!
Since May 1st 2002, the Console Mode Version of CHESS is available for free download for Unix (Linux, Solaris) users. This command-line version is a powerful tool for scripting-usage, but does not provide the graphical options such as activity diagrams. Read more about this release at the Download page.

PATCHES
Since the release of version 2.0 several bugs have been reported. One of the most annoying bug concerns windows XP (and windows 2000?): some errors, although properly detected by CHESS, are not 'bubbled up' to the user via a pop-up window and JCHESS seems to hang. These and other bugs have been repaired and all users of version 2.0 can download the patch for free.