Erlkönig: Useful Website

camelcamelcamel.com

• Tracks the price history of millions of Amazon products using charts.
• Exposes fake discounts by showing true historical costs over time.
• Sends automated email alerts when items hit your target prices.

fast.com

• Estimates internet download speeds instantly using Netflix servers.
• Displays upload speed and latency to measure connection responsiveness.
• Provides numbers to help troubleshoot routers and report issues to providers.

gutenberg.org

• Hosts a volunteer-supported library of over 77,000 free ebooks.
• Focuses on older literature where United States copyright has expired.
• Permits users to read books online or download them for mobile devices.

haveibeenpwned.com

• Checks if your email address has been leaked in a data breach.
• Identifies the specific data categories that were exposed during an incident.
• Offers a separate secure tool to check compromised passwords independently.

ocw.mit.edu

• Publishes free educational materials for over 2,500 real college courses.
• Includes lecture notes, assignments, exams, and recorded video lectures.
• Operates with no admission process, tuition fees, or required accounts.

photopea.com

• Edits images directly inside a web browser without any software downloads.
• Supports advanced desktop features like layers, masks, blending, and PSD files.
• Processes files locally on your device to protect your privacy.

scholar.google.com

• Indexes scholarly literature like journal papers, theses, books, and patents.
• Features a "cited by" function to track how other scholars discuss a paper.
• Helps locate free legal copies of papers from university repositories.

tineye.com / lens.google

• Performs reverse image searches using pictures instead of text words.
• Exposes misinformation by finding where images previously appeared online.
• Lets users sort results by the oldest indexed date to track original sources.

web.archive.org

• Stores historical snapshots of more than one trillion web pages.
• Recovers dead links, edited articles, and vanished website information.
• Allows users to compare how public pages have changed over time.

wolframalpha.com

• Computes structured answers using mathematical algorithms instead of listing links.
• Solves equations, analyzes chemistry, converts units, and builds direct charts.
• Extracts precise mathematical results directly into the browser window.