The Gospel Coalition has recently revamped it’s website, and it now holds 8,480 (at this date) audio files and 842 video files. This archive has very nice topic and speaker indexes, and categories of sermons, Q&A, conference messages and interviews. This is a motherload of materials.
Gospel Coalition audio archive >>>
Note that not all materials are *free* downloads, however. Sometimes we see such lists and think they are. Rather, it is a set of links pointing to these resources. Perhaps worth noting…