The only list I could find was: Five US,Fiver, The Hits, TMF, Sky Sports News,Sky 3, UK History, Dave, FTN and E4?
These are the encrypted channels that a "Freesat from Sky" card will unlock. Such a card can be bought (direct from Sky, UK addresses only) for a one-time £20 from Sky. There are no monthly charges. You can also currently use an expired Sky subscription card to receive these channels although that MIGHT not continue with the new edition of cards currently being sent to subscribers and it is likely that existing expired cards used for these channels will shortly stop working in this respect.