See:
- Open source software. This is essentially the same as free software ("free as in freedom") but the different terms reflect a different philosophy and emphasis. For a nice summary of where open source stands in a range of applications see Open source won
- Open Source Appropriate Technology (OSAT)
- Open source engineering software
- Open-sustainability
- Open source patents
- Open source rapid prototyping of OSAT
- Open source technology
- Open content
Compare and contrast with the more restricted