Colorful math help with illustrative examples and math games for all ages.
This site takes longer to navigate, but is the closest that I've found to my personal tutoring style.
Comprehensive list of topics covered from pre-algebra through beginning trigonometry.
This is the resource that I go to when I need to re-learn a topic quickly.
For a $10/month subscription fee, you can get an infinite number of practice problems that give you immediate feedback on whether you got the answer right or not.
Not the best intelligent tutoring system out there, but it serves for problem generation. If you really don't know the material, don't try to learn it from here, you'll wind up frustrated and distressed. If you do know the material but need more practice, this is the perfect infinite worksheet for you.
Free with the option to subscribe, Wolfram Alpha has an absolute ton of features including (for subscribers) step-by-step work for solving problems from the basics through calculus.
Even if you don't plan on using it, poke your nose around the site. It has some really cool stuff from all fields, not just math. I use this for checking my work and it helped me pass my calculus classes.
Less of a resource, more of a great way to feel smart killing time.
My mentor at WPI, Erin Ottmar, and several of her colleagues developed this concept of Graspable Math. The idea is that you're supposed to use it on a tablet, so you drag and drop the terms or perform operations on them with your finger. It works on normal computers too, but you're clicking instead of moving the bits around with your hands.
The key here is that after you enter in your equation, it won't let you do any wrong operation, so by the end, you know you'll have the correct answer. You can also drag the dot next to the problem on the right side down to have it show all of your steps.
I'll keep this updated when we have actual public releases of the other Graspable Math-based activities.
Easy to use resource for all things APA formatting.
Great way to make sure you formatted that weird citation correctly and to double check your spacing or headings.
Plagiarism checker that's free and easy to use that checks your document against another document that you upload.
Great way to make sure that you paraphrased that article correctly.
From the team who does Extra Credits comes this cool YouTube series that covers different historical events that haven't gotten a lot of press. The episodes are short, animated, easy to follow and leave you wanting to watch more.
Need to know what the best value computer part is since yours needs replacing? Go to Tom's Hardware. Have a problem with an install? Go to Tom's Hardware. Experiencing some weird issue? Tom's Hardware probably has some kind of forum post on it.
Tired of manually looking up different parts to make sure that they're all compatible? So far I haven't had any trouble with this resource that lets you build a whole PC, including peripherals, checks the compatibility, and prices it out for you.
Attend the conference without attending the conference! Clear half hour or hour long videos on all sorts of topics. Not just for video game folks!