I've downloaded a few of the WWDC videos on my iPad using the WWDC app. I've also marked some of the videos as favourites.
Can I access these videos on my Mac, maybe from iTunes? I found the videos here but there I can't manage favourites and mark as watched/unwatched.
Best Answer
Yes - the same videos that were presented on the iOS app are available as video downloads. All recent WWDC content is posted for anyone to download with no developer account needed:
The 2014 content is available for download in HD/SD and PDF format for almost all the recent sessions. The metadata in terms of stars / favorites and such aren't portable from the iOS app, so you will have to either keep using the iOS device or make playlists in iTunes / use OS X labels and tags and folders / paper notes of which sessions you want to star / revisit, etc...
According to Hal Mueller on Twitter, if you run a script to download all the videos, they will take the following amount of disk space for the 2014 year content:
I would note, that you will want to check the history of the script. It currently requires macOS and swift and only downloads the 2016 videos. Older versions might still work with older years, so check the revision history of the shell script version of the tool if you don't want 2016 videos.