As Job says, ScriptSync or Script Based editing is unique to Avid and parts of it protected by patents. The ability to index and sync the text phonetically to the text is powered by Nexidia. Before that, users would (and still can) index manually in real time (the red record button at the top of the UI). Adobe Premiere Pro has something reminiscent of ScriptSync but takes a very different approach where the script is attached to each clip whereas ScriptSync has clips attached to a script.
PhraseFind is ad-hoc searching of spoken dialog. That functionality too is powered by Nexidia and can be found in the original Get and Soundbite (Boris) available for FCP, FCPX, Premiere Pro, and recently as an add-on to CATDV (Dialogue Search). More on these solutions and the technology of phonetic indexing and search can be found on their website at:
https://www.nexidia.com/media/
Michael