The Tressel Sync for Obsidian plugin integrates Tressel with Obsidian, allowing users to easily sync and export content from platforms like Twitter, Reddit, Kindle, Pocket, Instapaper, Raindrop, Hypothes.is, and Hacker News into their Obsidian vaults. Once the plugin is set up with a personal access token, content is automatically synced each time Obsidian is opened, with an option for manual syncing. The plugin supports organizing content into subfolders and handles highlights, annotations, and bookmarks from various sources. It provides seamless management of external content, making it ideal for users who want to centralize and access their online readings and highlights directly within Obsidian.