Synthesis Toolkit, a cross-platform library in C++ for sound synthesis and physical modelling
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SIM Application Toolkit, a part of GSM telephony standard responsible for applications stored on SIM
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Systems Tool Kit (formerly Satellite Tool Kit), an astrodynamics computer program from Analytical Graphics, Inc.
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Storage Technology Corporation (StorageTek), a data storage company acquired in 2005 by Sun Microsystems
AGI states that STK has more than 40,000 installations at more than 800 global organizations such as NASA, ESA, CNES, DLR, Boeing, JAXA, ISRO, Lockheed Martin, Northrop Grumman, EADS, DOD, and Civil Air Patrol.
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Users on Windows have the option of using STK programatically via OLE Automation.
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STK has also been used by various news organizations to graphically depict current events to a wider audience, including the deorbit of Russia's Mir Space Station, the Space Shuttle Columbia diasaster, the Iridium/Cosmos collision, the asteroid 2012 DA-14 close approach and various North Korea missile tests.
The ONE Group's European locations, STK and Cucina Aselina, are now open in the ME Hotel London, the Foster and Partners-designed property in the Strand in the original home of BBC Radio.