Pretty your exception backtrace.

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

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

This gem provide `finalize_block` method.

IRB where every keystroke, result and exception gets a show

Ractor::LVar

mysql2_recorder

Show Ruby script with execution results.

safepoint-based sampling performance profiler for Ruby

Inline expression tracing for Ruby

Build Ruby from source code.

to keep namespace

MmappedString

lumitrace_sample_project

Sync modified files using pscp on Windows.

An experimental language based on Ruby, but with types for each operation

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

Analyze your Ruby scripts with prism

kv: A page viewer written in Ruby

iseq_collector gem

vim clone on Ruby with agentic coding

SimplePaste web application

MaNy project examples

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

namespace for debug.gem (rdbg command)