Computing
ABC (computer virus)
ABC (programming language), a programming language and environment
ABC (stream cipher), a stream cipher algorithm
ABC (Yet Another BitTorrent Client), a BitTorrent client
ABC notation, a language for music notation
Abstract base class, a programming language concept
Acorn Business Computer, a series of microcomputers announced at the end of 1983 by the British company Acorn Computers
.abc, ActionScript Byte Code files; see Comparison of application virtual machines
Alcatel Business Communications, a telecommunications protocol
Artificial bee colony algorithm, a search algorithm
Atanasoff–Berry computer, an early electronic digital computer
ABC, a line of computers by Dataindustrier AB