EIS's clients include schools, tertiary institutions, libraries, federal and state government departments, publishers, corporations and professional bodies.

EIS has developed eComPress electronic publications for millions of users for organisations like International Accounting Standards Board, International Federation of Accountants, CPA Australia, The Institute of Chartered Accountants of Australia, Department of Treasury, WA Treasury, Shell, Zurich, Engineers Australia, CCH, CCH Asia, Prentice Hall, Pan MacMillan, Taxpayers Australia, Financial Planning Association of Australia, NSW Office of State Revenue, National Centre for Classification in Health, World Health Organization, International Monetary Fund, Organisation for Economic Co-operation and Development, Australian Government Department of Health and Ageing, Institute of Arbitrators and Mediators Australia.

EIS has the most users in Australia of any electronic Dictionary. Its Australian Technology Showcase and Consensus Award winning electronic MegaLex Dictionaries are used by institutions such as The Australian Bureau of Statistics, Department of State Development, The Auditor Generals Department, Gold Coast City Libraries, Lane Cove Library, Hunter Institute of Tafe and many private and government schools throughout the country.