Specto is a Linux-based desktop application that allows you to watch for configurable events and get notified instantly when updates are available. Things that you can monitor include websites, emails, files/folders, system processes and connection ports.
There's no dearth of Web feed readers for Linux that allow you to keep tabs on new postings on a Web site. But what if the Web site or page you're interested in doesn't provide a feed? Specto is a nifty little Python application that lets you monitor changes to static or dynamic pages. You can configure Specto to monitor changes to wiki pages, blog posts, forum threads, your email inbox, and even files and folders on your own system. An unobtrusive pop-up from its system tray icon informs you of all changes, so you don't have to hop around looking for updates.