What is the greatest or latest? Been going through some vintage recordings that lack high frequencies and was looking to excite them, when asking this question popped to my mind. I use software, but if there's staple hardware or something that you've found to work, then would be interesting to hear experiences about those as well.
Lets keep this question strictly about "exciters" or specific distortion plug-ins/hardware, free of other techniques for adding high frequency content (EQ, MB compression, reverb ERs, layering etc.).