See the Ethereum Foundation Devcon3 playlists on YouTube here:
Official Devcon3 photos are available here for viewing:
Ethereum Foundation’s annual developers conference has been scaled up three times in the last three months to include 2.5 times more presentations, cover 3-4 times more square footage and provide free streaming of Main Hall presentations to those who are not able to join us in person. An additional smaller Breakout Hall was added all four days of Devcon so that many more presentations could be included in the program. Presentations from both halls will be recorded for posting online.
There are two Breakout Sessions this year: