A powerful, privacy-first PDF editor that runs in your browser or locally on your computer. Add text, signatures, merge, split, export to DOCX — 39 features, completely free and offline. Files never touch our servers.

VisuAlgo was conceptualised in 2011 by Associate Professor Steven Halim (NUS School of Computing) as a tool to help his students better understand data structures and algorithms, by allowing them to learn the basics on their own and at their own pace. Together with his students from the National University of Singapore, a series of visualizations were developed and consolidated, from simple sorting algorithms to complex graph data structures. Though specifically designed for the use of NUS students taking various data structure and algorithm classes (CS1010/equivalent, CS2040/equivalent (inclusive of IT5003)), CS3230, CS3233, and CS4234), as advocators of online learning, we hope that curious minds around the world will find these visualizations useful as well.

Journey through classic short stories filled with adventure, horror, tragedy and fantasy. Read For Free, Anywhere, Anytime. H. G. Wells, Edgar Allan Poe, H. P. Lovecraft, Anton Chekhov, Beatrix Potter.

All-in-one online, free, browser-based toolkit for geographic data analysis. It offers: - Interactive Map Tools: Measure distances and areas directly on the map. - Data Format Converters: Convert between TopoJSON and GeoJSON formats seamlessly. - Coordinate Utilities: Perform conversions and other coordinate-based operations.

No sign-up required, and all tools run client-side for privacy and speed.

Built with open standards and designed for developers, educators, and anyone interested in geographic data.

Games, visualizations, interactives and other weird stuff.