Learning & Research directories
Search engines and indexes for courses, papers, and datasets.
12 directories
Class Central
The search engine for MOOCs and online courses.
arXiv
Open preprint repository for CS, math, and physics.
Semantic Scholar
AI-assisted search across more than 200 million papers.
Google Scholar
Broad scholarly search with citation tracking.
CORE
Aggregator of open-access papers from repositories worldwide.
Kaggle
Datasets, competitions, and notebooks for data science.
OpenML
Open platform for sharing ML datasets and experiments.
data.world
Collaborative catalog of open datasets and projects.
Awesome Awesomeness
The original curated list of awesome lists.
MIT OpenCourseWare
Free course materials from nearly every MIT class.
Course Report
Directory and reviews of coding bootcamps and tech courses.
SSRN
Preprints and working papers in the social sciences.