Hiya oasisfan!The BB at night show is called BigBrother:AfterDark and it'll be shown on ShoToo (one of Showtime's tiered channels) from Midnight to 3am (BigBrother time). It'll cover all the late night activities, censor-free (minus any singing).
ShoToo, to my knowledge, is only carried on the east coast at the moment.
And as far as I know, there are no other "free" ways to see more of the houseguests above the 3 weekly shows on CBS.
The Live Feeds cost a bit. Not a lot. But they do cost money to get them.
Then again, if I remember correctly, you're the king of youtube.
Finding all those clips for us last season.
That's all free stuff.