The Custom File Extensions and Types plugin enhances Obsidian by allowing users to associate specific file extensions with different in-app view types through customizable settings. It enables seamless editing and configuration of file extensions, including options for mobile-specific settings and overriding default behaviors. Users can assign various extensions like `.txt`, `.html`, or `.yaml` to the markdown view or other registered views, ensuring greater flexibility in managing files. The plugin includes tools for debugging and viewing all current file extension associations, providing clarity and compatibility with other plugins. Extensions are case-insensitive, and real-time updates ensure immediate application of changes.

The Code Preview plugin for Obsidian allows users to preview code directly from within their notes. By specifying a file path, users can display portions of the code, highlighting specific lines or sections based on configurable parameters. The plugin supports a variety of features such as line range selection, regular expression matching, and text-based search for highlighting code. It also includes options for customizing the appearance, such as line numbers and background color for highlights. Ideal for developers and anyone working with code in Obsidian, the plugin offers an easy way to visualize and navigate through code files without leaving the note-taking environment.

The AI Providers plugin acts as a centralized configuration tool for managing AI service settings within Obsidian. It allows users to store and share API keys and provider configurations across multiple AI-powered plugins, eliminating the need to enter the same credentials repeatedly. Supporting providers like Ollama, OpenAI, and OpenRouter-compatible APIs, the plugin simplifies the integration of AI tools in Obsidian. It is particularly useful for developers looking to streamline AI integration without handling provider-specific APIs manually.