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Programming explanations alongside algorithm practice

A topic-organized collection of programming tutorials

A project-oriented programming editor, code browser, and analyzer for navigating source.

Plan team work in spaces, then move work items through a configurable workflow.

Record browser journeys and turn them into editable web end-to-end tests.

Test email and SMS workflows by routing app-generated messages to controllable inboxes and numbers.

A Java-based load-testing application for exercising services and analyzing their performance under simulated traffic.

A font-discovery library with detailed filters and shared preview settings.

Collect automated test results in one place and analyze failures across test runs.

A desktop web-application testing toolkit that combines an intercepting proxy, manual tools, and automated vulnerability scans.

Edit code on iPhone or iPad with broad syntax highlighting, remote file access, and an SSH terminal.

A reactive Python notebook editor that saves notebooks as ordinary Python files.

Configurable CRM with service-based access and selective table exports

Write statically typed Nim programs and compile them with a toolchain designed for systems and application work.

A browser IDE for running short code samples or building supported multi-file projects across many languages.

Compile systems software with a general-purpose language built around explicit control and cross-compilation.

Write visual sketches in a desktop editor and run them in a graphics window with Processing.

Compile Ruby-inspired, statically typed Crystal programs into native executables.

A language, runtime, and library platform for concurrent, fault-tolerant applications.

Preview and deploy infrastructure changes through the same CI workflow as application code.

Create compiled programs and reusable modules with Go's language and standard toolchain.

A graphical environment for building measurement, instrument-control, and test applications with the G language.

Add static type checking and compiler configuration to a JavaScript project.

Build JVM and multiplatform applications with an open-source language and compiler toolchain.