Launch [debugger](https://github.com/ruby/debug) if spec is failed.

safepoint-based sampling performance profiler for Ruby

Inline expression tracing for Ruby

This gem provide `finalize_block` method.

GitHub Action for lumitrace: trace a PR's changed lines during tests and post the results as a Check Run.

Pure-Ruby DOOM, AOT-compiled to wasm by ASTro / koruby_precise, playable in the browser

Sync modified files using pscp on Windows.

Pretty your exception backtrace.

Show Ruby script with execution results.

iseq_collector gem

vim clone on Ruby with agentic coding

Build Ruby from source code.

MaNy project examples

Ractor::LVar

mysql2_recorder

Dump compiled iseq by binary (kakidasu) and load binary (yomidasu)

Analyze your Ruby scripts with prism

kv: A page viewer written in Ruby

Two Puma-derived Rack servers exercising Ruby's newest concurrency features: the M:N scheduler (PuMaNy) and Ractors (Punicorn).

プレゼントを提供するためのウェブアプリケーション

SimplePaste web application

to keep namespace

MmappedString

lumitrace_sample_project

namespace for debug.gem (rdbg command)