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Category: Developer Tools, Linux, ReferenceExplainShell takes a shell command and breaks it down, showing what each flag, argument, and option does by pulling f

Codeforces hosts regular programming contests where participants solve algorithmic problems under time pressure. After each contest, submissions are judged and

HackerRank provides coding challenges in algorithms, data structures, SQL, functional programming, and domain-specific topics. It is used by both individuals fo

GeeksforGeeks covers data structures, algorithms, programming languages, databases, operating systems, and computer science theory. Its articles are written for

W3Schools has been teaching web technologies since 1998. It covers HTML, CSS, JavaScript, SQL, Python, PHP, and more with short lessons, interactive examples, a

Frontend Mentor provides design files and specifications for realistic front-end projects, from simple cards to multi-page layouts with interactive components.

Codewars presents small coding challenges called kata, ranked by difficulty. You solve them in your chosen language, submit, and then see how other people solve

Exercism offers free coding exercises in over 60 programming languages, but the real difference is the mentoring. After you submit a solution, a volunteer mento

n8n is a workflow automation tool that you can self-host, which makes it attractive to teams that want control over their data and no per-task pricing. It suppo

Zapier connects over 6,000 apps so that an event in one triggers an action in another. A new form response can create a Trello card, a Stripe payment can update

Airtable looks like a spreadsheet but works more like a database. Each row is a record, each column has a defined type, and records can link to each other acros

Atlassian makes Jira, Confluence, Bitbucket, Trello, and other tools used by software teams around the world. Jira handles issue tracking and agile planning. Co

SourceForge has been hosting open-source projects and distributing their releases since the late 1990s. It offers file hosting, version control, mailing lists,

Coolors generates five-color palettes with a press of the spacebar. You can lock colors you like and keep generating until the rest of the palette fits. The too

TinyPNG reduces the file size of PNG and JPEG images by selectively reducing the number of colors, merging shades that are hard for the human eye to distinguish

Carbon turns a snippet of code into a clean, shareable image. You paste your code, choose a syntax theme, adjust the padding and window controls, and export a P

Monkeytype is a typing test that strips away everything except the text and your fingers. There are no ads, no pop-ups, and no unnecessary features. You choose

Excalidraw is a simple drawing tool that produces diagrams with a sketchy, hand-drawn feel. You can create flowcharts, architecture diagrams, wireframes, and mi

The Internet Archive is a nonprofit that has been preserving digital material since 1996. Its most famous feature is the Wayback Machine, which stores snapshots

Hacker News is a plain-text link aggregator run by Y Combinator. The front page is driven by user votes, and the comment sections often contain more insight tha

Product Hunt is a daily leaderboard of new products. Makers launch apps, developer tools, AI services, hardware, and indie projects, and the community upvotes w

Lemmy works like Reddit: communities, posts, upvotes, threaded comments. The difference is that it runs on hundreds of independently operated servers that talk

Radio Garden presents a rotating globe covered in green dots. Each dot is a live radio station, and clicking one starts playing it immediately. You can spin the

Photopea opens PSD files, edits layers and masks, applies filters, and exports to multiple formats — all without installing anything. It runs entirely in the b

Project Gutenberg has been putting books online since 1971, long before the web existed. The collection now holds nearly 80,000 titles, all of them free to down