routerRouter is a request matcher and URL generator
mutexMutex lock implementation
sessionA session service, PSR-15 session middleware, and a flash message service which helps use one-time messages.
app-apiAPI application project template
var-dumperHelper for dumping variable for debug purposes
stringsString helper methods and an inflector
demoYii 3 demo application
yii-giiYii code generator extension
filesUseful methods to manage files and directories
cachePSR-16 compatible cache library
authwww.yiiframework.com/
yii-auth-clientYii Framework external authentication via OAuth and OpenID Extension
httpHandy HTTP utility such as method constants and status codes
viewYii view rendering library
csrfPSR-15 middleware implementing CSRF protection
cookiesConvenient way to use cookies with PSR-7
logPSR-3 compatible logger
proxyGeneral purpose proxy
appYii 3 application template
htmlHandy library to generate HTML