Sigasi HDT, the compelling next-generation development environment for VHDL designers, was extensively tested through a public beta program that ran from May 5th 2009 until January 13th 2010. Through this program, Sigasi nurtured a community of VHDL designers that takes advantage of modern development techniques. Thanks to the comments and feedback of our beta users, Sigasi HDT 1.0 was released on January 13th 2010, as the first IDE for VHDL with interactive error reporting (and a lot of other features). If you want to evaluate Sigasi, you can register for a trial