Essentials of the Upanishads
Detailed essay on the Upanishads, with quotes and background information. Includes downloadable e-book of the Isa Upanishad.

Hinduwebsite: Upanishads Home Page
Presents original English translations of several Upanishads, writings, commentaries and essays on the philosophy of the Upanishads

Kena Upanishad
An English translation of the Kena Upanishad (also known as the Talavakara Upanishad) by F.Max Mueller.

Khandogya-Upanishad Part 1
The Chandogya, as translated by Max Muller, in his work of 1879.

The Upanishads
Contains a collections of quotations taken from the principal Upanishads.

The Upanishads
Introduction to the Upanishads with comments on individual Upanishads.

The Upanishads
A translation of 11 Upanishads by Swami Nikhilananda.

The Upanishads: Max Mueller
Complete text of Muellers' two volume Sacred Books of the East translation of the Upanishads.

Upanishad
Isha, Katha, Kena, and Maitrayani Upanishads in HTML and Pdf format. Also a brief introduction to Upanishads.