• The Hoya Page by The Hoya Society International
  - There are some description and a lot of hoya picture.
• Ohh Yeah Hoya! by Edward Gilding
  - A lot of picture with description about hoya.
• Hoyas by Michael Miyashiro
  - A lot of nice picture with some information
• Hoya in Hawaii by Michael Miyashiro
  - Top Ten Favorite Hoyas in Hawaii with description
• Hoya photographs from Michael Miyashiro
  - A lot of picture
• Hoya! Hoya! Hoya! by Magdi
  - A lot of picture, the exchange area and website link.
• East Asian Flora and Tropical Plants Hoya by Lup San
  - A lot of picture with description
• Asclepiads by Iztok Mulej
  - Some Hoyas picture with a lot of relative plants

      Nursery & Dealer

• Bob Smoley's Gardenworld (USA)
• Botanova (Sweden)
• Green: Plants Research (Hawaii, USA)
• Paul Shirley (Netherland)
• Rainbow Gardens (California, USA)
• MM's Hoya Page (USA)