TutorVista not only offers online precalculus help but also provides precalculus reviews. They can also "asses students' capability and design a personalized precalculus test help program for the student."
The Math Page website is free and maintained by Lawrence Spector, a teacher of mathematics at the Borough of Manhattan Community College. On this website, the student will find a section titled "Topics in Precalculus." Listed here are 26 precalculus subtopics. Subjects such as linear functions, quadratics and basic graphs are covered.
Tutornext is a subscription service that offers K through 12 and college-level online tutoring 24 hours a day, seven days a week. According to Tutornext, "Our tutors are extremely involved in the day to day academic progress of each student -- so right from everyday assignments to class quizzes they monitor the progress of each student to ensure that they excel in the subject."
Brightstorm is a free website that allows you to create an account to log in for math assistance. You can also access this site using your Facebook account. On this site, qualified math teachers explain precalculus terms and problems through the use of videos.