Common Application: https://www.commonapp.org

Coalition for College: https://www.coalitionforcollegeaccess.org

California Application: https://apply.universityofcalifornia.edu/my-application/login

UCAS: https://www.ucas.com/applying/applying-university

Studielink: https://www.studielink.nl

OUAC: https://www.ouac.on.ca (Application portal for universities in Ontario)

Universitaly: https://www.universitaly.it (The portal for pre-enrolment applications)

IELTS: https://www.ielts.org

TOEFL: https://www.ets.org/toefl

GRE: https://www.ets.org/gre

GMAT: https://www.mba.com

AP: https://www.collegeboard.org

SAT: https://www.collegeboard.org

ACT: https://www.act.org

PTE: https://www.pearsonpte.com

DUOLINGO: https://www.englishtest.duolingo.com/applicants

Niche: https://www.niche.com

College Board - Big Future: https://bigfuture.collegeboard.org/college-search

College Scorecard: https://collegescorecard.ed.gov

CollegeData: https://www.collegedata.com

Appily: https://www.appily.com

Cappex: https://capp-ex.com

QS World University Rankings: https://www.topuniversities.com/qs-world-university-rankings

Times Higher Education (THE) World University Rankings: https://www.timeshighereducation.com

US News Education Rankings: https://www.usnews.com/best-colleges/rankings

Shanghai Ranking: https://www.shanghairanking.com

Khan Academy: https://www.khanacademy.org (Math, Science, ELA, SAT/AP, Finance, CS)

Coursera: https://www.coursera.org (College-level STEM, CS, Humanities, Learning Skills)

edX: https://www.edx.org (STEM, AP, College Prep, Philosophy, Writing)

Udemy: udemy.com (Programming, Skills, Design, Career, Finance)

MIT OpenCourseWare (OCW): ocw.mit.edu (STEM, AP Courses, Engineering, Literature, Philosophy)