Memtest86+ is a free, open-source, stand-alone memory testing tool for 32-bit and 64-bit computers, with support for both BIOS and UEFI boot. It provides more thorough memory checking than standard BIOS memory tests, and supports IA-32, x86-64, and LoongArch64 system architectures. The tool is released under the GNU GPL v2.0 license, and is not affiliated with the closed-source Memtest86 software owned by PassMark Software Pty Ltd.
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Android emulator for playing mobile games and running Android apps on Windows.
Mentionmapp Analytics helps audit websites, improve search visibility, and monitor SEO or analytics performance.
metagoofil is a Python security tool that searches Google for specific file types hosted on a target website, with optional local download of discovered files. It is intended for open source intelligence gathering, penetration testing, and identifying files organizations publicly expose to search indexers. It is a maintained fork of the original metagoofil project, preinstalled by default on Kali Linux, and deliberately excludes built-in metadata analysis in favor of external tools like exiftool.
Metasploit is a penetration testing framework developed as a collaboration between the open source community and Rapid7. It is used to find security issues, verify vulnerability mitigations and manage security assessments. The Metasploit Framework is open source, and Metasploit Pro is a commercial product with support. Documentation and community channels are available for help.
Microlink SDK is a developer tool, library, or framework for building, testing, or maintaining software.
ModelViewer is a web component for displaying interactive 3D models on the web and in AR. It offers documentation, examples, API reference and addons, plus an editor for testing models and downloading a starter website. It supports the last two major versions of evergreen desktop and mobile browsers and the last two versions of Safari.
Modern CSS Solutions is a series by frontend developer Stephanie Eckles examining modern CSS approaches to common frontend problems. Articles cover topics such as custom properties, container query units, CSS math functions, selectors, accessibility upgrades, and testing browser feature support with fallbacks and build tools. A companion site, SmolCSS, offers minimal snippets for modern layouts and components.
Browser playground for testing Microsoft's Monaco code editor and editor features.
MouseTester.io is a browser-based tool for testing mouse buttons, wheel, polling rate and double-click behavior. It uses browser pointer events to report click response and polling rate data without drivers or downloads, and runs tests locally in the browser.
Moz Local is a local SEO tool for managing business listings across directories. It offers auto-syncing of listings, listing health monitoring, Google Business Profile performance insights, and centralized review management from one dashboard. Paid plans include Lite, Preferred and Elite tiers, with larger deployments handled through enterprise custom pricing.
Moz On-Page Grader is an SEO tool that takes a URL and keyword and returns a page optimization score with a checklist of recommended fixes. It is accessed through a Moz Pro free trial, which also includes Link Explorer, Keyword Explorer and On-Demand Crawl.
Mullvad VPN helps find, check, or use proxy services for alternate web access and privacy testing.
Mutahunter is an open-source, language-agnostic mutation testing tool that uses large language models. It is installed as a Python package requiring Python 3.11 or later and run against a repository with a test command, source path and test path, reporting mutation coverage and survived or killed mutants.
The National Materials Corrosion and Protection Data Center is a Chinese scientific data center providing corrosion and protection data. Its portal offers basic and environmental corrosion data, industrial corrosion data, material data, coating data, standards, and special subjects such as marine engineering and reinforced concrete. It also lists testing and inspection services, a corrosion knowledge base, an expert database, and a company database.
Network Tool helps audit websites, improve search visibility, and monitor SEO or analytics performance.
NoteBin is a pastebin-style website: a note is accessed through a link, and giving the URL to anyone allows them to access the note as well. The site states it requires a modern browser and that it is using an insecure connection, which the site says should only be used for testing.
NoxPlayer is an Android emulator for Windows and Mac that supports Android 9. It is intended for playing mobile games and running apps on a computer, and supports keyboard, gamepad, script recording and multiple instances.
Null PHP Script is a developer tool, library, or framework for building, testing, or maintaining software.
Online Python Compiler is a developer tool, library, or framework for building, testing, or maintaining software.
An online tool that parses the HTML of a web page and extracts its internal and external links, displaying them in plain text. After a page address is submitted, the system downloads the page and lists the resulting URLs. It is built with the Lynx command-line browser and described for research, development, security assessments and web page testing.
OpenVPN helps find, check, or use proxy services for alternate web access and privacy testing.
OpenZeppelin is a developer security tool for smart contracts, testing, monitoring, or audits.
OpenZeppelin Defender is a developer security tool for smart contracts, testing, monitoring, or audits.