Horarios VLC, titled Moverse por Valencia on the site, is a free transport guide for Valencia covering Metrovalencia, EMT and Cercanias, plus other trains and buses. It includes a route planner and links to iPhone and Android apps.
The site says it is free and needs no account. It uses open data from FGV, EMT Valencia, Renfe and the Generalitat, and states that it is not affiliated with FGV, EMT or Renfe.
I wanted one fast, free place to check Valencia's public transport timetables without juggling several apps.