| Category | Type | Website |
| Theatre | Theatre Tickets | Telecharge |
| Theatre | Award Shows | Tony Awards |
| Theatre | Guilds & Unions | International Alliance of Theatrical Stage Employees |
| Theatre | Opera | Dallas Opera |
| Theatre | Opera | Florida Grand Opera |
| Theatre | Opera | Hors concours, The Metropolitan Opera House |
| Theatre | Opera | Houston Grand Opera |
| Theatre | Opera | Los Angeles Opera |
| Theatre | Opera | Lyric Opera of Chicago |
| Theatre | Opera | Michigan Opera Theatre |
| Theatre | Opera | Minnesota Opera |
| Theatre | Opera | New York City Opera |
| Theatre | Opera | San Diego Opera |
| Theatre | Opera | San Francisco Opera |
| Theatre | Opera | Santa Fe Opera |
| Theatre | Opera | Seattle Opera |
| Theatre | Opera | Washington National Opera |
| Theatre | Performance Art | List US Opera Companies |
| Theatre | Performance Art | NYC Ballet |
| Theatre | Theater News | Lortel Foundation |
| Theatre | Theater News | TDF Theatre Development Fund |
| Theatre | Theater Reviews | Did He Like It |
| Theatre | Theatre News | Broadway World |
| Theatre | Theatre News | Broadway.org |
| Theatre | Theatre News | Playbill |
| Theatre | Theatre News | Playbill Vault |
| Theatre | Theatre News | Show-Score |
