Academic Free License 3.0A permissive license with explicit patent grant language, often discussed alongside OSL from the same author.Apache License 2.0A widely-used permissive license with an explicit patent grant, used across much of the open source ecosystem.Artistic License 2.0A flexible license balancing free redistribution with a structured approach to modified versions; common in Perl ecosystems.Boost Software License 1.0A short permissive license popular in C++ libraries because of its simplicity and explicit redistribution grant.BSD 2-Clause LicenseA simple permissive BSD license with attribution and disclaimer, but without the advertising clause.BSD 3-Clause LicenseThe common modern BSD license with attribution, disclaimer and a non-endorsement clause.BSD 4-Clause LicenseThe historical BSD license variant including the old advertising clause; less convenient, but important to archive.BSD Zero Clause LicenseAn extremely permissive “public-domain-like” BSD variant with essentially no conditions beyond warranty disclaimer.Creative Commons Attribution 4.0The standard permissive license for cultural works, documentation and open data. Any use is allowed as long as the author is credited.Creative Commons Zero 1.0 UniversalA public-domain dedication instrument widely used for code snippets, data, test fixtures and reference material.ISC LicenseA concise permissive license often described as functionally similar to simplified BSD and MIT forms.MIT LicenseThe most common short permissive license: minimal obligations, broad reuse rights, and near-universal tooling support.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.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.