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Use mutation testing to see whether a JVM test suite catches deliberately changed code.

Measure how well JavaScript and TypeScript tests detect deliberately introduced code changes.

Use a reactive document database and JavaScript query functions in a TypeScript backend.

A coverage-guided fuzzer that mutates input corpora to find crashes and hangs in instrumented programs.

Mutate Python code and rerun its tests to find changes the suite fails to catch.

Switch and customize Chinese input schemes

Type with a chosen language and input method

Type with swipes, suggestions and voice input

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

Encrypt files or streams with explicit recipients and a small command-line interface.

Validate Python data against typed models and generate matching JSON Schema.

Collects and routes log events between input sources and destinations through a plugin-based pipeline.

Add a configurable colour and opacity picker through a web input attribute.

Enter text through an adaptable on-screen keyboard

Pen smoothing and drawing rulers for Windows art applications

Continuously fuzz accepted open-source projects to find crashes and other input-handling bugs.

Add a configurable colour picker to ordinary web input fields.

Type Indian languages through desktop, mobile or web input

Build interactive terminal applications in Go with an event-driven model, update, and view loop.

A Python property-based testing library that generates inputs to challenge the properties your code should preserve.

Replace text in files or streams with a compact, readable command-line syntax.

David Jonathan Ross’s type library with full-featured font trials.

Collect, process, and route logs, metrics, and traces with a lightweight telemetry agent.

Compile, run, debug, and share small programs in a browser-based editor.