
Hakuiin Zenji
Song of Zazen, translated by Norman Waddell
and a version by Zen Buddhist Order of Hsu Yun.
A brief bio and a nice collection of Hakuin's paintings here.
Hakuin's Letter in Answer to an Old Nun of the Hokke Sect Actually, two letters. In the first, Hakuin talks about the Lotus Sutra. In the second he discusses his own experiences. translated by Philip Yampolsky
Hui Neng & The Platform Sutra
The Sixth Patriarch's Platform Sutra, translated by A.F.Price and Wong Mou-Lam.
Another complete version, translated by The Buddhist Text Translation Society with commentary by Tripitaka Master Hua is also available. Here you will find it in plain text. Here as a 454 page .pdf document (not recommended for slow connections)
John R McRae's translation is here (172 pages)
Carl Bielefeldt and Lewis Lancaster: T'an Ching (Platform Scripture) Bielefeldt and Lancaster give an excellent overview of state of current (1975) translations and scholarship of the Platform Sutra.
from Philosophy East and West Vol. 25, No. 2, 1975
Morten Schlütter: Transmission and Enlightenment in Chan Buddhism Seen Through the Platform Sūtra (Liuzu tanjing 六祖壇經) This paper, discusses developments in the conceptualization of transmission and enlightenment in the Platform Sutra's main line of development, beginning with the earliest version found at Dunhuang leading down to the orthodox version included in the Taishō canon. from Chung-Hwa Buddhist Journal, no. 20, pp. 379~410 (2007)
Autobiography of Hui Neng translated by A.F.Price and Wong Mou-Lam This is an excerpt from the Platform Sutra
Huang Po
Huang Po: (J. Obaku) a small sample of some of the teachings of this great master. He is believed to have died in 850 A.D. and many consider him the founder of the Lin Chi (J. Rinzai) school. The only complete translation is John Blofeld's The Zen Teachings of Huang Po. Read a "gonzo review" here.
Other Zen Masters
The Autobiography & Maxims of Chan Master Han Shan(1546-1623) The complete book (60 pages in pdf) available here. An interesting account of life in 17th Century China. Reads very much like Xu Yun's Empty Cloud: "in my fifty-first year, I..."
Hui Hai: The Essential Gateway to Truth by Means of Instantaneous Awaking. An English translation but unfortunately, it doesn't say who translated this.
Hsi Yun: The Ultimate Reality Transcends What Can Be Expressed in Words "The document, here employed, in abbreviated form, presents the teaching of Hsi Yun, one of the Ch’an (or Zen) masters who lived about 840 A.D. His teaching is reported by P’ei Hsiu, an official and scholar who became a student under Hsi Yun. It gives a more or less sympathetic disclosure of Ch’an philosophy."
Hsuan-Tsang: Verses Delineating The Eight Consciousnesses by Tripitaka Master Hsuan-Tsang Of The Tang Dynasty translation and commentary by Ronald Epstein. The entire book is available for downloading as a pdf document.
Lin Chi (J. Rinzai) Irmgard Schloegl's classic translation of The Zen Teachings of Rinzai is available in its entirety here as a .pdf document. Free. (86 pages--be patient)
Nagarjuna: The Precious Garland Ratnavali of Nagarjuna also known as Nagarjuna's Letter to a Friend, this is advice given by Nagarjuna to the Southern Indian King Surabhidhadra in 123 four-line verses. This version has broken the writing down into 500 verses.