Microlink - Extract structured data from any website
Algorithm Visualizer - Write down your algorithm to be visualized
CRX Extractor - Get any Chrome Extension source code. Learn and hack!
Google Algorithm Changes - Shows fluctuations in SERPs matched with algorithmic updates
Parsers - Parsers is a platform for extracting unstructured data from sites and their visualization without code.
Grokking Algorithms - An illustrated guide for programmers & other curious people