SiteDelta is described as 'Add-on for old versions of Mozilla Firefox (before the introduction of WebExtensions). SiteDelta can scan for changes to a website since your last visit' and is an app in the OS & Utilities category. There are more than 25 alternatives to SiteDelta for a variety of platforms, including Online / Web-based, Windows, Linux, Android and SaaS. The best alternative is Huginn, which is both free and Open Source. Other great apps like SiteDelta are UptimeRobot (Freemium), Distill Web Monitor (Freemium), Update Scanner (Free, Open Source) and FiveFilters Feed Creator (Freemium).
Huginn is a system for building agents that perform automated tasks for you online. They can read the web, watch for events, and take actions on your behalf. Huginn's Agents create and consume events, propagating them along a directed graph.
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(S), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
Distill is a web monitoring tool. It can monitor RSS feeds, a webpage or a part of webpage. Alerts in the form of pop-up, audio or emails can be received. Featured highlights: • Content selection from any webpage including iframes.
Monitor webpages: Get Newsfeeds from web pages that do not deliver RSS Customization: Monitor portions of webpages via CSS selectors / ignore Ads and Social Media Elements Handling: Manage your monitorings. Get them via RSS or e-Mail