1, The full form of OSS is Open Source Software. It’s used on Computing ,Sofware & Applications in Worldwide

Open-source software (OSS) is computer software that is available in source code form: the source code and certain other rights normally reserved for copyright holders are provided under a software license that permits users to study, change, improve and at times also to distribute the software.

2, The full form of OSS is Open Sound System. It’s used on Computing ,Compression & Encoding in Worldwide

The Open Sound System (OSS) is an interface for making and capturing sound in Unix or Unix-like operating systems. It is based on standard Unix devices (i.e. POSIX read, write, ioctl, etc.). The term also sometimes refers to the software in a Unix kernel that provides the OSS interface; it can be thought of as a device driver, or a collection of device drivers for sound controller hardware.

3, The full form of OSS is Office of Strategic Services. It’s used on Governmental ,Security & Defence in United States

The Office of Strategic Services (OSS) was a United States intelligence agency formed during World War II. It was the wartime intelligence agency, and it was a predecessor of the Central Intelligence Agency (CIA). The OSS was formed in order to coordinate espionage activities behind enemy lines for the branches of the United States Armed Forces.