| AuthHelper | |
| Bitbucket | |
| ComposerMirror | Composer mirror utilities |
| ConfigValidator | Validates a composer configuration. |
| ErrorHandler | Convert PHP errors into exceptions |
| Filesystem | |
| Git | |
| GitHub | |
| GitLab | |
| Hg | |
| IniHelper | Provides ini file location functions that work with and without a restart. |
| NoProxyPattern | Tests URLs against no_proxy patterns. |
| Perforce | |
| Platform | Platform helper for uniform platform-specific tests. |
| ProcessExecutor | |
| RemoteFilesystem | |
| Silencer | Temporarily suppress PHP error reporting, usually warnings and below. |
| SpdxLicense | |
| StreamContextFactory | Allows the creation of a basic context supporting http proxy |
| Svn | |
| TlsHelper | |
| Url |