Derivatives must be free
Public can add to codebase
Source code modifiable
Source code available
Unlimited usage
Redistributable
Zero license price
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Open Source – Linux/GPL
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Open Source - Apache
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Open Source - BSD
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Royalty-free libraries
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Freeware (binaries)
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*Unenforced licensing
Shareware
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*Usage dependent
Non-commercial use
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*Limited features
Trial software
Commercial