what i do is i either get an unsuspecting tech, or for the last show i had the teacher who was the assistant director sitting next to me doing effects. basically i just put them on a CD in order of how they go and just hit the play button. when i have time to rehearse, i will do it myself and just have someone by me doing "standby" basically someone to hit cues for me if i need it or fix a wireless mic problem
etc. if i dont have enough rehearsal time i have someone just do cues for me. anyway i have never felt the need to use a cue program, especially if your cd player has a remote and you have time to make a cd with the effects in the order you need them.