HippoCampus
Online interactive lessons (free) covering high school algebra and calculus courses (including AP calculus).
www.hippocampus.org
MathMistakes.info
Common student mistakes in algebra, trig, and calculus explained.
mathmistakes.info
Quickmath
Online calculator that automatically provides solutions to algebra problems and equations.
www.quickmath.com
ECalc
An excellent online calculator. Both basic and scientific forms. Features include complex numbers math, unit conversion, expression history, linear and root equation solvers, and more. Also available as a desktop application. See also their math reference sheets
www.ecalc.com
Webmath.com
Are you stuck on a math problem? Instant-answer problem solvers, huge amount of already solved example problems, or ask an expert.
www.webmath.com
Online tutoring
Tutor Bungalow
A free home tutoring marketplace. Tutors post profiles for free and students contact them directly for free. Limited revenue is generated from the sale of featured listings for certain tutors. The website has a very clean, user-friendly layout.
www.tutorbungalow.com
Think Math Tutoring
Schedule your own appointments with the tutor of your choice using a virtual online classroom. Pricing $0.50 / minute.
www.thinkmathtutoring.com
ZiiZoo
An online marketplace to buy tutoring. See rates per hour, rating, and online availability instantly.
www.ziizoo.com/ref/hmsc
TutorSpree
A marketplace for high-quality tutoring. The tutors at TutorSpree are all educators.
http://www.tutorspree.com
MathLessons.com
Find a math tutor in your area. Listings by country, state, and city.
www.mathlessons.com
Parliament Tutors
Private, In-home SAT Prep to LSAT Prep in New York, New Jersey, Cleveland, Miami and Los Angeles.
www.parliamenttutors.com
Math Tutoring by Email
Get tutoring by email or phone from Joe Pagano. Rates $50-75 per hour.
www.mathbyjoe.com/email_tutoring.html
SchoolTrainer
Academic coaching (tutoring) for $19 per a session of 50 minutes.
www.schooltrainer.com
CalcTutor
Interactive online tutoring in calculus, $17.50 an hour
www.calctutor.ca
St. Louis Tutoring
Private In-Home Tutoring Services in St. Louis.
stlouis.varsitytutors.com
TutorVista
Online tutoring done using an interactive whiteboard with chat. Also offering SAT/ACT test prep services.
www.tutorvista.com
Jennifer Thompson Private Math Tutoring
Online math tutoring via email; $30 for 1 hour or $15 for 30 minutes. Or, private tutoring at her California home.
www.tutor4math.com
Math in a Box
Professional, certified math teacher Susan Johnsey offers online tutoring, online classes, and free advice.
www.mathinabox.com
TutorTalk.org
Tutoring with live teachers for a fraction of the price of in-person sessions. For $6 per hour, kids can learn to ace the SAT and other exams or bring in their own homework problems.
www.tutortalk.org
TutorMatch.com
Searchable directory of thousands of tutors around the world. Searching is free but the tutors won't be.
www.tutormatch.com
David Roth Tutor and Homework Help
Tutoring or homework help, $15/hour, via Yahoo Messenger or MSN Messenger.
www.tutor-homework.com
WyZAnt Math Tutors
A nationwide tutor-student matching service. Search for local in-home math tutors in your area.
www.wyzant.com/Math_tutors.aspx
Open Door Math Online Tutoring
An online math tutoring service. All instruction is carried out by one qualified, experienced, Canadian educator. Base price $25 per hour.
sites.google.com/site/emathhelp
Maths Tutor by iTutorMaths
Online GCSE courses where the child works with a maths tutor either in weekly sessions, or more often in a "crammer" course.
www.itutormaths.co.uk