Groups
Canadian Improv Games, Hudson River Playback Theatre, Improvisational Theatre at The College of William , Original Theatre Project, Peterborough Improv Group, Pip's Laundry Improv, Playback Theatre Company, Pocket Full of Tales Children Theater, Redding Improv Players, River's Edge Playback Theatre
Individuals
Alistair Cook, Armando Diaz, Daena Giardella, Dan Izzo, Fuzzy Gerdes, Jessica Holmes, Johnny Melville, Jonathan Browning, Leslie McManus, Martin Gero
Workshops
Angel City Improv, Improv Etc., ImprovWorks, Joya Cory Workshops, Paul Sills' Wisconsin Theater Game Center, The Spolin Center, The Staircase
Improv Encyclopedia
Collection of improv games, drama exercises, improv handles, and references, indexed in 27 categories. Resources can be downloaded as a pdf booklet.
International Playback Theatre Network (IPTN)
Supports development of playback theatre worldwide through its programs and services, membership benefits, training resources, administration, and contacts.
The Improv Page
Bernie Roehl presents a clearinghouse for information about improvisational theatre.
The New Improv Page
Information portal for improv. Groups, news and games.