open-source

Of or relating to software where the source code is freely available and licensed in a manner that permits modification and redistribution.

Linux is an open-source operating system.

ASP.NET MVC has been under an open-source license since the initial release, but it was just open-source code instead of a full open-source project.

Describing any product whose composition or method of manufacturing is public knowledge and not proprietary.

open-source cola

open-source hardware

Relying on publicly available information (open sources).

open-source intelligence

The ramifications of disinformation spill on to the streets with tangible, often devastating real-world consequences. These processes were already under way in 2014, when I founded the open-source investigative group Bellingcat.

To release the source code of, so as to permit modification and redistribution.

The big Unix company Sun Microsystems bought the code for StarOffice in 1999, and some time afterward they open-sourced as much of it as they could.