Ruote is a mature Ruby workflow engine (BPM) that orchestrates long-running business processes through a tree of expressions (sequence, concurrence, if, participant, etc.). The engine routes workitems to registered participants, persists process state via pluggable storage backends (in-memory, file system, composite), and supports process definitions in Ruby DSL, XML, JSON, and a custom Radial format. It provides a full API via Ruote::Dashboard for launching, canceling, pausing, and inspecting processes, along with error handling, timers, observers, and cross-process communication via await/listen. The codebase is well-structured with a clear expression lifecycle, participant abstraction, and a service-oriented architecture. However, the project is explicitly deprecated—the README states 'Do not involve ruote in your new project' and directs users to the successor flor. Development ceased around 2013, and the code relies on outdated Ruby idioms and dependencies (e.g., sourcify, parslet 1.4.0), making it unsuitable for modern Ruby projects without significant adaptation.