Vquestor & AJ, forte Ensemble is still alive and going strong. I like forte since it is specifically designed for use in live performances. I am currently testing a Beta version which should be released fairly soon. In addition, the 2 guys who develop this software are always available to assist their clients/customers - very good customer service. However, forte is not free.
Also, note that forte allows for Audio input so that you can use things like Guitar Effects, Vocal Harmonizers, etc.
[This message has been edited by Frank L. Rosenthal (edited 06-17-2005).]