The Wayback Machine is in the process of reconstruction, so the link posted awhile ago no longer works. Try this:
Jens Bjørneboe in English You may have to wait a bit for it to redirect.
The site is way out of date; many of the books listed are out of print. According to Amazon, those currently in print are Amputation, Powderhouse and The Silence. I'm not sure about Moment of Freedom, but the whole trilogy is still listed in the catalog of Norvik Press in England.