This is a CLI tool for installing multiple Ruby implementations (CRuby, JRuby, TruffleRuby, mruby) from source. It auto-detects the operating system, package manager, and downloader, then downloads, verifies checksums, applies patches, compiles, and installs the Ruby. The architecture is a collection of sourced bash scripts organized into a plugin system: each Ruby implementation has its own `functions.sh` and `dependencies.sh` that override generic steps. The main entry point is `bin/ruby-install`, which orchestrates the process using utility functions from `share/ruby-install/`. The codebase is well-structured with extensive test coverage using shunit2, and follows a strict coding style. It does not handle data pipelines or analytics; it is purely a system administration tool.

ruby-nmap is a Ruby library that provides programmatic access to the nmap network scanning tool. It consists of two main components: 1) A command-line interface builder (Nmap::Command) that allows Ruby programs to configure and execute nmap scans with full access to nmap's options through a Ruby DSL, and 2) An XML parser (Nmap::XML) that converts nmap's XML output into navigable Ruby objects representing hosts, ports, services, OS detection results, and script output. The library acts as a bridge between Ruby applications and the nmap executable, handling the complexity of command-line argument construction and XML parsing while providing an idiomatic Ruby interface. The project is actively maintained with recent commits, comprehensive test coverage, and support for multiple Ruby versions.