As a custom developer Maris has worked with major blue chip clients including Intel, NASA, Apple Computers, Discovery, Harcourt Brace, John Wiley & Sons Inc., Saunders, The Learning Company, Houghton Mifflin, Dorling Kindersley, United Soft Media.

A major recent project has been Edugen - an open standards based technology for the creation and delivery of educational and training courses. The technology was conceived and developed by Maris Technologies and implemented with a number of clients before all rights were sold to John Wiley & Sons, Inc .