Britannica
Encyclopaedia Britannica, expert-written reference.
Learning
Oskyla
Oskyla
@user-ad6380f090
871 sitesJoined 2026/10/19
italki
Book one-on-one lessons with language tutors.
Learning
Busuu
Language courses with feedback from native speakers.
Learning
Memrise
Learn languages with real native-speaker videos.
Learning
TED
Short talks on ideas worth spreading.
Learning
Harvard CS50
Harvard's famous free intro to computer science.
Learning
The Odin Project
Free full-stack web development curriculum.
Learning
Codecademy
Interactive coding lessons in the browser.
Learning
Udemy
Affordable video courses on almost any skill.
Learning
SSL Labs Server Test
Deep analysis of a server's SSL/TLS setup.
Development
Security Headers
Scan your site's HTTP security headers.
Development
PageSpeed Insights
Google PageSpeed Insights for Core Web Vitals.
Development
Runoob 菜鸟教程
Runoob beginner programming tutorials in Chinese.
Development
OSS Insight
Insights and rankings for GitHub repositories.
Development
grep.app
Search code across half a million public Git repos.
Development
shadcn/ui
Copy-paste React components built on Radix and Tailwind.
Development
Tailwind CSS
Utility-first CSS framework with excellent docs.
Development
Bundlephobia
Check the size cost of adding an npm package.
Development
PyPI
The Python package index.
Development
npm
The JavaScript package registry.
Development
explainshell
See what each part of a shell command does.
Development
JSON Crack
Visualize JSON as interactive graphs.
Development
Transform
Convert JSON to TypeScript, SVG to JSX and much more.
Development
Crontab Guru
Explain and build cron schedule expressions.
Development