A well-designed plugin SDK with client and server contexts, RPC mechanisms, settings management, theme contributions, timeline renderers, and lifecycle hooks. It demonstrates a clean contract-based architecture that could be extracted and reused for any extensible application. The separation of client and server concerns, along with typed contracts, makes it a model for plugin systems.

A shared protocol package defining all wire formats, message schemas, and validation logic using Zod. It includes AOT-compiled validators for performance. This pattern of extracting all inter-service communication schemas into a standalone package is highly reusable for any distributed system, ensuring type safety and contract enforcement across boundaries.

A standalone syntax highlighting package using Lezer grammars for multiple languages (C#, Nix, Svelte, etc.). It is designed to be safe for daemon-side use without an editor runtime. The pattern of vendoring grammars and providing a pure-function highlighter is reusable for any application needing code rendering without heavy dependencies.

An end-to-end encrypted relay transport for device pairing, implementing key exchange, WebSocket tunneling, and cutover proxy logic. The pattern of using a relay for NAT traversal with E2EE is reusable for any application requiring secure remote connections between devices.

A custom overlay scrollbar implementation with pure geometry computation, platform-specific rendering (native vs web), and integration with FlatList. It demonstrates a reusable pattern for custom scrollbar UI that can be extracted and applied to any React Native or web project needing consistent scrollbar styling.