JESS is the world's largest single source of thermodynamic information relating to electrolytes, reactions in aqueous media, and hydrocarbon phase equilibria. The full contents of certain databases are available to inspect online (click the links below to start browsing).
Reactions	80,000 reactions 226,000 equilibrium constants 32,000 enthalpy values
Species	4,700 primitive species 63,000 composite species 13,000 chemical names 2,000 CAS Registry numbers
Literature	31,000 literature references 30,000 author names 2,200 journals/publications 6,000 keywords

The full JESS package also includes the following databases:

Physicochemical Properties	58 properties 860 solutes 500,000 property values
Electrolyte Solubility	2,200 soluble phases 120,000 solubility records
Pitzer parameters	18,000 parameter values for aqueous electrolyte systems
Hydrocarbon Solubility	Solid-liquid equilibria (SLE) 22 natural gas components 231 data sets (with contributions from Corey Baker and Eric F. May)