Defcon (computer security) - https://www.youtube.com/user/DEFCONConference/playlists
PyCon 2016 (Python) - https://www.youtube.com/channel/UCwTD5zJbsQGJN75MwbykYNw/vid...
PyCon 2015 (Python) - https://www.youtube.com/channel/UCgxzjK6GuOHVKR_08TT4hJQ/vid...
PyCon 2014 (Python) - https://www.youtube.com/user/PyCon2014/videos
BSDCan (FreeBSD, OpenBSD and others) - couldn't find a dedicated channel but this one has some BSDCan playlists - https://www.youtube.com/user/osbootcamp/playlists
Chaos Communication Congress (computer security, organized by the Chaos Computer Club aka. CCC) - https://www.youtube.com/user/CCCen/playlists
Black Hat (computer security) - https://www.youtube.com/user/BlackHatOfficialYT/playlists
DerbyCon (computer security) - again, couldn't find a dedicated channel but this one has DerbyCon in addition to some others which might be interesting as well - https://www.youtube.com/user/irongeek/playlists
The Gruqg on OpSec: https://youtu.be/9XaYdCdwiWU
Russ Cox's ACME tutorial: https://youtu.be/dP1xVpMPn8M
Jessie Frazelle on running containers on the desktop: https://youtu.be/1qlLUf7KtAw
Defcon (computer security) - https://www.youtube.com/user/DEFCONConference/playlists
PyCon 2016 (Python) - https://www.youtube.com/channel/UCwTD5zJbsQGJN75MwbykYNw/vid...
PyCon 2015 (Python) - https://www.youtube.com/channel/UCgxzjK6GuOHVKR_08TT4hJQ/vid...
PyCon 2014 (Python) - https://www.youtube.com/user/PyCon2014/videos
BSDCan (FreeBSD, OpenBSD and others) - couldn't find a dedicated channel but this one has some BSDCan playlists - https://www.youtube.com/user/osbootcamp/playlists
Chaos Communication Congress (computer security, organized by the Chaos Computer Club aka. CCC) - https://www.youtube.com/user/CCCen/playlists
Black Hat (computer security) - https://www.youtube.com/user/BlackHatOfficialYT/playlists
DerbyCon (computer security) - again, couldn't find a dedicated channel but this one has DerbyCon in addition to some others which might be interesting as well - https://www.youtube.com/user/irongeek/playlists