"Purplemath's algebra lessons are written with the student in mind. These lessons emphasize the practicalities rather than the technicalities, demonstrating dependable techniques, warning of likely "trick" questions, and pointing out common mistakes. The lessons are cross-referenced to help you find related material, and a "search" box is on every page to help you find what you're looking for.
This is a link to a wiki where people can prove that 0.9999999 is equivalent to 1. This qualifies as a wiki because anyone can edit the page (the earliest entry I found was from 2008.) I like this wiki because it shows many ways to prove the two values are equivalent. Some of the proofs are rather simple and can be understood by students in an beginning or intermediate algebra class. I would use this wiki in my teaching by asking students if they agree with the proofs and to come up with their own proofs for the values.
It took me about an hour to find this podcast. I wanted a podcast that addressed topics that are could be understood by a student in a college level math class. These short podcast give a step by step solution for various algebra problems and could be used as a supplemental way of explaining a particular problem. I would use these podcast if there were a few more examples for each topic. For instance, I would like at least 3 podcast for the common denominator problem. I would probably use the podcast as a section review or with a worksheet that had similar examples.
WeBWorK is an open-source online homework system for math and sciences courses. WeBWorK is supported by the MAA and the NSF and comes with a National Problem Library (NPL) of over 20,000 homework problems. Problems in the NPL target most lower division undergraduate math courses and some advanced courses. Supported courses include college algebra, discrete mathematics, probability and statistics, single and multivariable calculus, differential equations, linear algebra and complex analysis.
