An up-to-date list of tokens available in VoiceAttack can be found in the "Text (and Text-To-Speech) Tokens" section of VoiceAttackHelp.pdf
VoiceAttackHelp.pdf contains information on VoiceAttack's features, and comes with any installation of VoiceAttack.
It can be opened by pressing the F1 key on your keyboard while VoiceAttack has focus, or by right-clicking the main window's title bar and choosing "Help Document" in the context menu, either of which should open the file in your default PDF reader.
The file can also be downloaded from
https://voiceattack.com/VoiceAttackHelp.pdf(edited by Pfeil to remove the outdated list of tokens)