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Earthdata Search is a browser-based tool for searching, discovering, visualizing, refining and accessing NASA Earth Observation data, offered through the IDN portal. The page requires JavaScript and a current browser; it notes an accessible alternative called Earthdata Access for users who need it.
A web-based tool that tests the IPv6 readiness of an internet domain and shows whether the visitor's own connection supports IPv6. It reports DNS-based results, including nameserver and mail exchanger records, and maintains a Hall of Fame of domains scoring five stars. It also warns when an embedded MAC-address identifies the device. The site requires JavaScript.
JavaDecompiler provides an online interface for extracting source code from .class and .jar binary files. It presents several Java decompilers, including CFR, JD, Procyon, Fernflower and JAD, with notes on each. The site also links to an APK decompiler and a knowledge base. JAD is listed for historical reasons only.
JDownloader is a free, open-source download management tool. Users can start, stop or pause downloads, limit bandwidth and auto-extract archives. It runs on Java and supports multiple platforms, with about 110 hoster and over 300 decrypt plug-ins listed.
Personal blog by Jeroen Reijn, a Cloud Solutions Architect, engineer and AWS Community Builder based in the Netherlands. The site contains posts about AWS, Serverless, DevOps and Java, including AWS CDK, ECS, CloudWatch and Quarkus topics.
JetBrains is a software vendor that creates intelligent development tools, including IntelliJ IDEA, an IDE for Java and Kotlin, and the Kotlin programming language. Its IDE lineup also includes PyCharm, WebStorm, DataGrip, Rider and CLion, several of which are free for non-commercial use.
jsdfe is a JavaScript deobfuscator built on nodejs and babel. Its purpose is to make obfuscated scripts easier to read and help users understand their roughly behavior. It is not intended to reproduce the original code or output executable code. The developer created it for personal use and notes that it often terminates with an uncaught error, may go into an infinite loop, and runs target code in a VM without considering security.
JShelter is a browser extension that controls browser APIs to limit what JavaScript on visited pages can see and gather. It is described as anti-malware software intended to mitigate threats including fingerprinting, tracking and data collection, and it offers protection levels that can restrict or forbid APIs on a site. It is available under the GNU General Public License.
This page is the Simple Widget Introduction of the Jupyter Widgets documentation. It describes widgets as eventful Python objects with a browser representation, used to build interactive GUIs for notebooks and synchronize information between Python and JavaScript. It covers display, views, closing widgets, and properties.
KanjiTomo is an OCR program for identifying Japanese text from images, optimized for kanji recognition. Pointing the mouse at any image on screen performs kanji and dictionary lookup at the same time, and both horizontal and vertical text are supported. Java is required, and it has been tested on Windows 10.
Kashipara is a site for downloading programming projects with source code. It lists projects in languages including Java, PHP, C# .NET, Android, VB, Python and HTML, CSS and JavaScript, along with project ideas and templates. It also lists premium or paid projects.
The source pages describe Kava as a decentralized blockchain combining Cosmos interoperability with Ethereum developer tooling. It is presented as EVM compatible, connected to the Cosmos ecosystem via the IBC protocol, and using Tendermint consensus. Developer resources include an EVM overview, JavaScript SDK and node guides, plus the Kava Rise incentive program.
KDevelop is a cross-platform integrated development environment for C, C++, Python, QML/JavaScript and PHP. It parses projects to provide code completion, supports multiple projects in one session, and offers a Git plugin and documentation integration. It is available for Linux, Windows and macOS.
Kittygram is an anonymous, privacy-friendly, lightweight, open-source Instagram frontend inspired by nitter. It serves fully prerendered pages instead of the JavaScript-heavy official web interface, and all requests are handled by Kittygram to reduce tracking. Users can search for users or hashtags, or replace www.instagram.com in a link with the domain. The source code is on Codeberg under AGPL-3.0.
KNIME Analytics Platform is free and open source data analytics software with a visual workflow builder for creating data science solutions. The page lists access, blending and transformation of data from any source, visualization and analysis, and saving, sharing and reuse of workflows. It also describes integrating scripting in Python, R and JavaScript and deploying solutions in the enterprise.
Lanemu P2P VPN is a server-less, decentralized virtual private network offered as an open-source alternative to Hamachi, Radmin, and ZeroTier. The project is written in Java and C and lists Linux, Windows, FreeBSD, and MacOS among its supported platforms.
A curated list of resources for learning PHP, covering tutorials, books, online courses and reference material. Topics include the LAMP stack, HTML, CSS, JavaScript, protocols, local development environments, tools, frameworks, object-oriented programming, design patterns, databases, testing, security and architecture.
A personal collection of solutions to LeetCode problems written in C++23, Java, Python, MySQL, and TypeScript. The site aims to provide readable code with consistent style. Solutions can be found by searching by number or title. The repository does not accept pull requests, though forking is allowed.
LibreCrawl is a free, open-source SEO crawler offered as an alternative to Screaming Frog. It performs technical audits covering meta tags, schema markup, hreflang, social tags and PageSpeed metrics, and integrates Playwright for JavaScript rendering of single-page applications. The project is MIT-licensed and can be self-hosted, with CSV, JSON and XML exports. A REST API provides programmatic control of crawls.
LibreSpeed is a free and open source speedtest that runs in the browser or can be self-hosted on a PHP, Golang, Rust or Node server. It is licensed under LGPL and measures download, upload, ping, and jitter without Flash, Java, or Websockets.
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.
Liveweave is a browser-based workspace for HTML, CSS, and JavaScript with a live preview and an AI coding assistant. It also offers a Python playground, an SVG graphics editor, and a color explorer. The site hosts a showcase of user-created experiments, such as templates and a 3D bowling game.
LoopVid is a browser-based tool for viewing submitted videos, with handling done via JavaScript in the user's browser. The site states that its server only sees a request for the front page. It notes it does not cover requests made to its blog, and it says the software is free with downloadable source code.
MALLET is a Java-based package for statistical natural language processing, document classification, clustering, topic modeling, information extraction, and other machine learning applications to text. It includes tools for converting text to features, classifiers such as Naïve Bayes, Maximum Entropy and Decision Trees, sequence tagging with Hidden Markov Models and Conditional Random Fields, and sampling-based topic model implementations.
