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The Festival Speech Synthesis System is a free (libre) / open-source software speech synthesizer developed at the Centre for Speech Technology Research (CSTR) of the University of Edinburgh. In order to enable Festival to sing, there is a plugin required called Flinger (Festival Singer) developed at the OGI School of Science and Engineering that was released in 2001. Free(b)soft has contributed Czech diphone voices and an accessible editor similar to the VOCALOID editor.
Flinger has been used by users in the western world for creating English demo songs.
Most voicebanks for Festival are available under a free license, whereas VOCALOID (and UTAU) use proprietary licenses. However, the voicebanks that come with Flinger are still proprietary. The experimental LMMS plugin Singerbot uses Festival for singing releases.