Open-source
Open source refers to anything that people can modify and share because its design is publicly accessible. This concept can broadly be divided into software and hardware. Designs can include source code, blueprints, schematics, and more.
Open-source resources
Deeper Knowledge on Open-Source

Open-Source Icons
Free, open-source icon sets

Open-Source Hardware
Useful open source software projects

Open-Source Organizations
Organizations dedicated to open-source

Open-Source Software
Useful open source software projects