The Infinity
- Online home of infinity with newsletter archive from 1996 to the present.
- http://www.wooster.edu/math/infinity/

Hotel Infinity
- Includes articles on big ideas and concepts, an introduction on background ideas, activities, books to read and a page of resources as well as a vocabulary index.
- http://www.c3.lanl.gov/mega-math/workbk/infinity/infinity.html

Counting to Infinity
- Introduction to infinity including the origins of the sign for infinity and pictures.
- http://www.scidiv.bcc.ctc.edu/Math/infinity.html

Mathnet : Does "Infinity" Exist?
- Looks at the 3 different contexts and says for each whether infinity exists in each one and why. Links to other essay on the same site on infinity.
- http://www.math.toronto.edu/mathnet/answers/infinity.html

Infinity
- Article about infinity. Talks about protential infinity and actual infinity.
- http://pespmc1.vub.ac.be/INFINITY.html