OwlPlug is a cross-platform desktop application for managing, scanning, and installing audio plugins (VST2, VST3, AU, LV2). It provides a JavaFX graphical interface for discovering plugins on the file system, organizing them with symlinks, browsing remote plugin registries (OwlPlug Registry and Open Audio Stack), and installing plugin bundles with SHA-256 verification. Additionally, it analyzes DAW project files from Ableton Live, REAPER, and Studio One to track plugin usage and dependencies, offering a project-level view of plugin inventory. The architecture is a multi-module Maven project with five modules: owlplug-client (main Spring Boot + JavaFX app), owlplug-host (JUCE-based native plugin scanner with JNI bindings), owlplug-controls (custom reusable JavaFX controls), owlplug-parsers (ANTLR4 grammar for REAPER project files), and owlplug-theme (custom AtlantaFX dark theme with SCSS compilation). The application uses H2 database via Hibernate/JPA for local persistence, EhCache for image caching, and a custom task execution framework for background operations. It employs an event-driven architecture using Spring's ApplicationEventPublisher for decoupled communication between components. Notable patterns include a clean MVC separation with BaseController/BaseService providing dependency injection, a strategy pattern for DAW project explorers (AbletonProjectExplorer, ReaperProjectExplorer, StudioOneProjectExplorer), adapter patterns for mapping remote registry JSON to JPA entities, and a custom database migration framework with versioned Java classes. The owlplug-controls module demonstrates high craftsmanship with custom animated dialogs, doughnut charts, chip views, and masonry panes that are self-contained and reusable in other JavaFX projects. Despite its solid architecture, the codebase exhibits significant technical drift. The pom.xml references a non-existent Spring Boot version 4.1.1, which would prevent building. Several controls are deprecated but still in use, hardcoded credentials are present in the repository, and the JNI-based native scanner is platform-specific and brittle. The custom database migration system, while functional, adds maintenance overhead compared to standard tools like Flyway. These issues lower the overall quality score but do not negate the well-designed core patterns and reusable components.