organization offering e-mail services Psychology of programming is sometimes referred to as 'empirical study of programming' or ESP Encapsulating Security Payload, an encryption protocol within the IPsec suite ESP game, an online human computation game Event stream processing, technology that acts on data streams ESP Cheat (video games), displaying contextual info such as the health, name and position of other participants (normally hidden from the player). Extended Stack Pointer register in Intel IA-32 (x86/32-bit) assembler Various processors by Espressif Systems, like the ESP32 or the ESP8266 Business Easy Software Products, a software-development company, originator of the Common UNIX Printing System (CUPS) Email service provider, a specialist organisation that offers bulk email marketing services Entertainment Software Publishing, a Japanese video-game publisher Spain and Spanish 3-letter code for Spain in ISO 3166-1 alpha-3 Spanish language (Español), non-ISO language code Spanish peseta, the ISO 4217 code for the former currency of Spain Other uses Eastern State Penitentiary, a museum in Philadelphia, former prison Effective Sensory Projection, a term used in the Silva self-help method Empire State Plaza in Albany, New York, U.S.A Empire State Pullers, a New York tractor pulling circuit English for specific purposes, a subset of English language learning and teaching Equally spaced polynomial in mathematics European Skeptics Podcast (TheESP), a weekly podcast representing several European skeptic organisations in Europe Extra-solar planet, a planet located outside the Solar System Ezilenlerin Sosyalist Partisi, a Turkish political party Extracellular polymeric substance, produced by bacteria for aggregation and gliding mobility