Fundamentals 7 min read

16 Hidden Gems: Must‑Visit Websites Every Developer Should Bookmark

This article compiles sixteen lesser‑known yet highly useful websites for programmers, ranging from a massive Hello World collection and Font Awesome cheatsheet to interactive algorithm visualizers, exclusive access sites, free e‑books, coding challenge platforms, and handy regex tools, all aimed at boosting productivity and learning.

Java Backend Technology
Java Backend Technology
Java Backend Technology
16 Hidden Gems: Must‑Visit Websites Every Developer Should Bookmark

Hello World Collection

The site gathers about 481 Hello World programs covering virtually every known programming language, offering a fun way to explore syntax across languages.

Hello World collection screenshot
Hello World collection screenshot

Font Awesome Cheatsheet

A concise reference for Font Awesome icons, useful for both developers and designers.

Font Awesome cheatsheet
Font Awesome cheatsheet

实验楼 – Leading Chinese IT Training Platform

An online learning site that provides a variety of development environments for hands‑on practice.

实验楼 platform screenshot
实验楼 platform screenshot

Algorithm Path‑Search Visualizer

An interactive animation that demonstrates various path‑search algorithms, making the concepts easy to grasp.

Algorithm visualizer
Algorithm visualizer

Most Exclusive Website

This novelty site allows only one visitor at a time for 60 seconds; it’s more of a fun curiosity than a practical tool.

Most Exclusive Website screenshot
Most Exclusive Website screenshot

IT eBooks – Free Downloads

A repository of free English-language IT e‑books for self‑learning.

IT eBooks download page
IT eBooks download page

Collecting All the Cheat Sheets

A comprehensive site that aggregates programming‑related cheat sheets and detailed knowledge points.

Cheat sheets collection
Cheat sheets collection

DevDocs API Documentation

An extensive online API reference that consolidates documentation for many programming languages and frameworks.

DevDocs interface
DevDocs interface

GEEKTyper.com

An online sandbox that simulates a hacker’s desktop, offering various scenarios for fun, movie‑style hacking experiences.

GEEKTyper interface
GEEKTyper interface

Codewars

A coding‑challenge platform where users solve kata in their chosen language, earning ranks and rewards similar to a game.

Codewars homepage
Codewars homepage

Free Chinese Programming Books

A collection of freely available Chinese programming books that can be read online at any time.

Chinese programming books list
Chinese programming books list

free‑programming‑books

An extensive GitHub repository listing thousands of free programming books, primarily in English.

free-programming-books repository
free-programming-books repository

The World's Most Exclusive Website

A mysterious site that grants access based on the number of Twitter followers you have, with ten rooms of increasing entry requirements.

World's Most Exclusive Website
World's Most Exclusive Website

O'Reilly Free Programming eBooks

O'Reilly offers a selection of free programming e‑books that can be downloaded without charge.

O'Reilly free eBooks
O'Reilly free eBooks

The Python Challenge

An online puzzle game where each level presents a Python‑related image; solving the puzzle advances you to the next level.

Python Challenge screenshot
Python Challenge screenshot

Regexper

An open‑source visualizer for regular expressions; simply input a regex and see a graphical representation.

Regexper tool
Regexper tool
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coding challengesprogramming toolsalgorithm visualizationdeveloper resourcesfree e‑booksuseful websites
Java Backend Technology
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Java Backend Technology

Focus on Java-related technologies: SSM, Spring ecosystem, microservices, MySQL, MyCat, clustering, distributed systems, middleware, Linux, networking, multithreading. Occasionally cover DevOps tools like Jenkins, Nexus, Docker, and ELK. Also share technical insights from time to time, committed to Java full-stack development!

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