The cost to you, the client, ranges from free to expensive, depending upon your needs and resources, and my availability.
My FontEdit program is used worldwide, offered free with opportunity to purchase the next version.
My TextList program was written for the public domain.
I've implemented and administered access security on mainframe computer systems.
I've automated manual operations and converted systems to newer computing environments.
I've designed, programmed, documented and implemented many applications including
accounting, astrology, inventory, payroll, scheduling, statistics, etc.