Directory
Published directory entries matching your search.
PineTools is a collection of free online tools for common tasks with mathematics, colors, text and lists, numbers, date and time, images, randomness, files and programming. The site also lists video tools described as being for creating, editing, cropping, trimming and merging videos.
Puzzlemaker is a puzzle generation tool from Discovery Education for teachers, students and parents. It creates customized puzzles such as word search, criss-cross, math puzzles, mazes and cryptograms from the user's own word lists, and puzzles can be printed.
A large online directory of thousands of free e-books on science and technology subjects, including computer science, medical science, mathematics, physics and biology. Users can upload their own books, which are checked before being added, or request a book. Links are listed by publisher and category with a download link for each title.
Red Blob Games publishes interactive visual explanations of math and algorithms, using examples from computer games and other projects. Topics include pathfinding, map generation from noise, hexagonal grids, Voronoi diagrams, graph theory and 2D visibility. Articles are free, with no signup and no ads, aimed mainly at independent, student and hobbyist software developers. The site also hosts demos such as map generators.
SAT Slayer is a free SAT question bank with over 3,000 real questions covering Reading & Writing and Math. It offers custom practice tests, practice by skill, progress tracking, and mistake review, with no ads, paywall, or account required.
School Yourself provides free interactive online math lessons and videos. Subjects include algebra, geometry, trigonometry, precalculus and calculus. The site states the lessons are free with unlimited access, and describes smart recommendations and personalized assessments.
Science Forums is a discussion forum with boards covering news, education, physics, chemistry, mathematics, biology, medical science, engineering, earth science, computer help, philosophy, religion and ethics. A homework help section offers assistance with homework problems rather than answers.
Shfl is a random sampler of album recommendations. Users can choose a category or leave the selection to chance. The site also lists recent guides on topics such as Blood and Fire, Power Pop and Math Rock.
Software Foundations is a series introducing the mathematical foundations of reliable software. Each volume's text and exercises are formalized as a proof script for the Rocq proof assistant. It targets readers from advanced undergraduates to researchers; no background in logic or programming languages is assumed.
SpeedCrunch is a free, open-source high-precision scientific calculator licensed under the GPL. It features a fast, keyboard-driven interface that displays results as users type, with a scrollable input history, customizable syntax highlighting, and an optional on-screen keypad. The calculator supports over 80 built-in mathematical functions, user-defined functions, variables, calculations with up to 50 digits of precision, complex numbers, numeral bases, unit conversions, and includes a library of over 150 scientific constants and common formulas. It is available for Windows, macOS, and Linux in multiple languages.
Stack Exchange operates a network of over 180 community-powered question-and-answer websites covering a wide range of specialized topics. Users can ask and answer questions on niche subjects across the network's sites, which include communities for mathematics, physics, law, programming, and other fields.
Stitz Zeager Open Source Mathematics provides free and open precalculus materials, including College Algebra, College Trigonometry and Precalculus textbooks by Carl Stitz and Jeff Zeager. A Precalculus 4i edition is available free on the interactive Ximera platform. Printed desk copies are offered to Verified Teachers through openintro.org.
StudyKit is a free student resource toolkit that provides over 50 tools across maths, science, writing and study categories. The toolkit includes calculators, timers, mind maps, flashcards, quiz generators, exam countdown trackers, and writing assistance tools for student use.
TeachEngineering is a free digital library providing K-12 STEM curriculum and educational resources. It hosts more than 2,200 peer-reviewed, standards-aligned hands-on activities and lessons focused on science, engineering design and math, aligned to NGSS and state standards. The platform empowers formal and informal educators regardless of engineering experience to deliver engaging STEM learning, and also offers professional development and a community of practice for engineering education.
The Algorithms - C++ is a repository of open-source implementations of various algorithms in C++, released under the MIT License. It covers topics including computer science, mathematics, statistics, data science, machine learning and engineering, and is intended as a learning resource for educators and students. The documentation is generated from the source code.
The Borr Project is a free educational initiative providing self-paced learning paths modeled on top university curricula for computer science, pre-college math, data science, and mathematics. It offers help via a Discord chat room and a public FAQ.
The TIB AV-Portal is a platform for scientific videos and audios in fields including technology/engineering, architecture, chemistry, information technology, mathematics and physics. It offers services such as quoting scientific videos with persistent identifiers, curating personal film programmes, publishing videos and producing videos with support. Content includes lecture series and digitised film collections.
Toys from Trash is a gallery page of Arvind Gupta's fun science toys, hosted at ArvindGuptaToys.com and made by Samir Dhurde. It presents topic categories including Air and water, Astronomy, Biology, Electricity and Magnetism, Math Magic, Paper Fun and Spinning Toys.
TutorialKart is a site offering free online courses and learning tutorials. It covers topics including programming, databases, SAP, Salesforce, web development, mathematics and physics, with beginner-friendly tutorials, quick references and practical examples organized by technology.
The University of West Florida is a university offering more than 110 undergraduate and graduate programs, with small class sizes and personalized attention from professors. Its site provides information on admissions, financial aid, campus and virtual tours, and military and veteran resources.
VDOC.PUB is an e-book library that offers free, downloadable e-books and documents for students. It organizes materials into categories such as technique, history, mathematics, linguistics and computers, and lists top, trending and latest documents for browsing.
Wichita State University is a four-year public research university in Wichita, Kansas, emphasizing innovation, applied learning and research opportunities. It offers applied learning through internships, co-ops and mentorships, and lists majors, programs, virtual tours, visits and cost calculation among its resources.
A curated list of creative Wordle variants and similar puzzle games, organized by categories such as symbol-based games, gameplay variations, themed Wordles, math and trivia, word mechanics, music and pop culture, and crossword hybrids.
xkcd is a webcomic described by its site as being about romance, sarcasm, math, and language. The site offers a comic archive, a random comic link, permanent links to individual comics, RSS and Atom feeds, and email alternatives. The comics are licensed under a Creative Commons Attribution-NonCommercial 2.5 License, which permits copying and sharing but not selling.
