Titles included in Humble Indie Bundle 8 are Dear Esther, Capsized, Awesomenauts, Thomas Was Alone, and Little Inferno. If paying more than the floating average price, Hotline Miami and Proteus are also included.
All the games are natively available on Linux except for Dear Esther, but a native port is in progress. Dear Esther is based upon Valve's Source Engine and we know a native Linux port is in the works but it hasn't been released yet.
More details on Humble Indie Bundle 8 via HumbleBundle.com or the trailer video embedded below.