Over on a discussion thread at VolleyTalk, I learned of a service called Volleyball Tracking. One can find online a sample report of a match, providing information on such statistics as serve speeds, total number of meters run by each player during a match, and set-to-spike times (in fractions of a second). In addition, the report includes heat-maps and vector-type serve-trajectory diagrams. A separate Volleyball Tracking webpage shows animation of player movements on points during the match.