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

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

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

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

lumitrace_sample_project

namespace for debug.gem (rdbg command)

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

mysql2_recorder

MmappedString

IRB where every keystroke, result and exception gets a show

Inline expression tracing for Ruby

Build Ruby from source code.

Show Ruby script with execution results.

MaNy project examples

Pretty your exception backtrace.

Ractor::LVar

Sync modified files using pscp on Windows.

SimplePaste web application

safepoint-based sampling performance profiler for Ruby

vim clone on Ruby with agentic coding

Analyze your Ruby scripts with prism

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

kv: A page viewer written in Ruby

iseq_collector gem

to keep namespace

This gem provide `finalize_block` method.

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