The original Portal is a paid game, and "free downloads" found on unofficial sites are often unsafe. However, there are legitimate ways to get it:
: A free app for residents to connect with city services, available on the App Store and Google Play. Portal Free Download
: For developers, PHPGurukul offers free source code for building an online shopping portal. The original Portal is a paid game, and
: A free, open-source platform for text analysis and statistical functions available via SourceForge . and Team Fortress 2 .
: This bundle often provides the best value, including Portal , Half-Life 2 , and Team Fortress 2 .