Open Software License 3.0A strong copyleft license with explicit patent language and conditions oriented toward modern software distribution.PostgreSQL LicenseA permissive license in the BSD tradition, closely associated with PostgreSQL and related tools.Python License 2.0The permissive PSF-family license associated with Python releases and parts of the Python ecosystem.SIL Open Font License 1.1The standard free license for fonts: fonts may be used, modified and redistributed, but must stay under the OFL.The UnlicenseA public-domain-style dedication with fallback license text for jurisdictions where pure public domain is uncertain.University of Illinois/NCSA Open Source LicenseA permissive academic-origin license used by notable infrastructure and compiler projects.zlib LicenseA short permissive license frequently used in compression, graphics and systems libraries.