Clannad – Hikari Mimamoru Sakamichi de is a 2010 game by Key (published in two discs), it is a PSP version of a collection of short stories for Clannad, first published as novels which also have drama CD version. [Click Here to See Review] Would love to see this game get translated… a youtube translation, most likely. Both games can be finished in 6 hours.
At some point Nagisa’s story was translated in youtube (it may still be). Kotomi’s and Fuuko’s (the text versions) were also translated, somewhere.