Laoshi is a Chinese language learning service built around smart flashcards and a spaced repetition system for studying Mandarin vocabulary and characters. It offers practice in reading and writing in the app, ready-made HSK word lists, goal setting and progress tracking. A family of digital tools includes a classroom, dictionary, grammar library, pinyin converter and Chinese name generator.
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Laws of UX is a collection of best practices that designers can consider when building user interfaces. It presents named principles such as the Aesthetic-Usability Effect, Choice Overload, Chunking, Cognitive Bias, Cognitive Load and the Doherty Threshold, each with a short explanation.
LearnCpp.com is a free website devoted to teaching programming in modern C++. Its lessons walk through the steps needed to write, compile and debug C++ programs. No prior programming experience is necessary, though programmers of all levels may benefit from the best practices, tips and insights. Chapters cover getting started, basics, functions, debugging, data types, and more.
Supports teaching, studying or skills practice with AI-guided learning tools.
A language-learning service offering audio flashcards, games, annotated texts, writing and listening drills, and AI conversation practice across many language combinations. It includes daily email exercises and progress tests, with free and premium accounts.
Supports teaching, studying or skills practice with AI-guided learning tools.
Lifeprint.com hosts ASL University, an American Sign Language resource site established in 1997 by Dr. Bill Vicars. It offers free ASL lessons, a sign dictionary with thousands of videos, fingerspelling practice, and Deaf culture resources for students, interpreters, teachers, and parents of Deaf children.
Linux Roadmap is a step-by-step guide to learning Linux in 2026, hosted on the roadmap.sh platform. roadmap.sh provides community-created roadmaps, best practices, projects, articles, resources, and learning journeys to help users select career paths and develop professional skills.
Linxicon is a daily word game in which players connect two random words by building a chain of words that bridges their meanings. It offers one word pair to connect per day, along with unlimited practice. The page says a new game starts on a timer.
Listudy is a free and open source chess training site that uses spaced repetition to help users memorize openings, train tactics, and practice endgames against Stockfish. It also offers blind tactics, where the board shows a position from several moves earlier, and pieceless tactics, where an empty board is accompanied by a list of piece locations. The source code is available on GitHub.
LittleLink is an open source, do-it-yourself alternative to Linktree for creating link-in-bio pages. It includes over 100 branded button options, supports light, dark, and automatic themes, and follows best practices for SEO, accessibility, and performance, with no required frameworks or JavaScript.
LoL Tracker is a team stats platform for League of Legends five-stacks, covering Flex, Ranked 5v5 and custom scrims on one team page. It offers MVP scores, team leaderboards, champion stats, draft practice and an AI coach. Plans include a free tier, Tryhard and Pro subscriptions.
Low-tech Magazine covers past and forgotten technologies and how they can inform sustainable energy practices. Its website is solar-powered and self-hosted, designed to reduce the energy use associated with accessing its content, and it notes that it sometimes goes offline. Articles and guides include building solar-powered devices and domestic low-tech projects.
Lurnby is a learning tool designed to help users understand and remember read content via neuroscience-validated techniques. It supports saving content from web articles, eBooks, emails and personal notes, customizable reading display settings, active highlighting and annotation, and automated spaced repetition, chunking and recall practice for retention. It offers Firefox and Chrome browser extensions and syncs notes and highlights across mobile and desktop devices.
Lurnby is an open-source tool for active reading and personal knowledge management. It works with web articles and EPUB files, allowing users to highlight, categorize, and review content via active recall and spaced repetition tools to build a personal knowledge practice. The project is associated with the www.lurnby.com domain.
Macroinvertebrates.org is a taxonomy browsing site for aquatic macroinvertebrates. It presents insect orders, families and genera, including beetles, true flies, mayflies, dragonflies and stoneflies, with collection and taxa list views. It also provides an identification key, training materials, a practice quiz, a glossary and a PocketMacros app.
MadAsMaths is a mathematics resources site offering free materials for students and teachers. It provides mathematical booklets classified by topic with questions and full solutions, practice papers with solutions, and Project Maths PowerPoint presentations. The site is static with no further updates and its contact form deactivated.
Supports teaching, studying or skills practice with AI-guided learning tools.
Math Planet is a free platform for learning mathematics, offering high school courses in Pre-algebra, Algebra 1, Algebra 2 and Geometry, plus SAT and ACT preparation with practice tests and tips. It is run by Mattecentrum, a non-profit organization.
McOsu is a free open-source circle-clicking rhythm game practice client for osu! beatmaps with Virtual Reality support. It is developed separately from osu! and has no direct affiliation with osu! or ppy Pty Ltd. It only supports osu!(standard) beatmaps, and the developer does not recommend it for players who have never played osu! before.
Medical news publication covering clinical research, health policy and professional practice.
Mindfulness Coach is a VA app developed by the National Center for PTSD to help Veterans, Service members and others learn mindfulness practice. It offers a gradual self-guided training program, an information library, audio-guided exercises, goal-setting and tracking, a mastery assessment, reminders and crisis resources. It is an education and self-care tool that does not replace professional care for PTSD or other mental health conditions.
Minify-JS.com is an online tool that reduces the size of JavaScript code using the Terser utility, which is compatible with the ES6+ standard. The site also includes resources, best practices, configuration examples and usage guides related to JavaScript minification.
Monoskop Log is a digital library of arts and humanities. Its entries list books and publications, including The Lab Book: Situated Practices in Media Studies and Networks of Care, with publisher, ISBN and page details. The site also notes a Mastodon account and newsletter.