macaddress.io
MAC Address looks up MAC address vendors and device manufacturer information.
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portcheckers.com
PortChecker is a free online tool for checking whether the ports of an internet-connected device are open or closed. It can also ping a remote server and test port forwarding settings. The tool attempts a TCP connection and reports success or a port open signal. Checking requires the computer to be reachable via a public IP address or have a port forwarded.
projectcsv.github.io
Project CSV is a free, open-source web application for viewing and editing .csv files in a browser or offline. It processes file data locally on the user's device without sending it over the network or collecting other data. The application allows selecting .csv files, adjusting settings, generating editable tables, and downloading the edited table.
speedvitals.com
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
bancuh.com
Bancuh is a free public adblock DNS service. According to the project, it blocks ads, trackers, malware, phishing, scams, adult content, gambling and dating sites for every device on a network through one DNS setting, with no app or account. It supports plain DNS, DNS-over-TLS and DNS-over-HTTPS, and the server and website are open source.
codesandbox.io
CodeSandbox is a cloud development platform that enables developers to code, collaborate and ship projects of any size from any device. Following its merger with Together AI, it offers the CodeSandbox SDK for programmatically creating isolated sandboxes for instant code execution in AI agents and code playgrounds. The platform provides secure, scalable environments with features such as quick start, auto-resume and customizable hibernation.
duckdb.org
DuckDB is an open-source SQL OLAP database management system. It is an analytical database that runs in-process and can be deployed from edge devices to servers with hundreds of cores. It offers idiomatic APIs for major programming languages and reads and writes formats such as CSV, JSON, Parquet, and Iceberg, locally or in object storage.
localhost.run
localhost.run connects web applications running on a computer to the internet using the SSH client already installed on major operating systems, with no download or signup required for free domains. It supports custom domains, automatic TLS certificates for HTTPS, and sharing URLs to show clients work or access a local application from another device.
meshtastic.org
Meshtastic is an open source, community-driven project that uses LoRa radios as an off-grid communication platform in areas without reliable communications infrastructure. Devices rebroadcast messages to form a mesh network without cell towers, WiFi or internet, and can be paired with a phone or computer via Bluetooth, WiFi or USB. Clients include Apple and Android apps, a web client and a Python CLI/SDK.
mossaik.app
Mossaik creates abstract SVG backgrounds with waves for websites, mobile devices, tablets, laptops and presentations. Options include the number of waves, angle, color and color mode, and designs can be exported as SVG or PNG images. The editor is launched from the site.
api.webprobe.org
NetBlocks provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
portchecker.co
Port Checker is a free online tool for checking open ports on a computer or device and verifying port forwarding setup on a router. It can help diagnose connection errors and problems with firewall setup, and supports entering a custom target IP address.
quad9.net
Quad9 is a free public recursive DNS service operated by the Swiss-based Quad9 Foundation. It replaces a default ISP or enterprise DNS configuration and blocks lookups of malicious host names from a threat list, aiming to protect devices against malware, phishing, spyware and botnets. Service addresses support malware blocking and DNSSEC validation, with optional encryption via HTTPS and TLS.
responsively.app
Responsively is a free and open source developer tool for responsive web development. It shows all devices side by side, replicates clicks, scrolls, and navigation across devices in real time, supports saving device combinations as Preview Suits, and includes a unified inspector and one-click screenshots.
responsivetesttool.com
ResponsiveTestTool is a free web tool for previewing any website across mobile, tablet, desktop and TV screen sizes. Users paste a URL to see how the site renders on different devices without signing up.
virejdasani.github.io
Responsivize is an open-source, cross-platform desktop app for developing responsive websites. It lets users test web apps on popular devices or custom dimensions and includes device frames, browser menubars and search bars. The app works on Windows, MacOS and Linux and is free to use.
seafile.com
Seafile is an open source, self-hosted file sync and share solution. It offers granular sharing permissions, multi-level file tagging, and built-in collaborative docs and wiki. The software supports access from any device and includes encryption and audit logs.
slint.dev
Slint is a declarative GUI toolkit for Rust, C++, JavaScript and Python, building native user interfaces for embedded, desktop and web from a single codebase. It supports integration into embedded Linux distributions such as Yocto, Torizon and Wayland, and can run on devices with or without a GPU. Pricing includes GPLv3 open-source, royalty-free and paid commercial options.
trippy.cli.rs
Trippy provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
vectorize-image.app
Vectorize Image is a browser-based tool that converts PNG, JPG or WebP images into scalable SVG files. Standard vectorization runs locally on the device, with no upload, sign-up or watermark, and offers Logo, Line Art and Photo presets. A paid Pro plan adds monthly AI credits for cloud vectorization, text-to-SVG and reference-to-SVG, plus batch processing.
waveform.com
Waveform Test provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
web1.0hosting.net
A static hosting service for smallweb and retro-computing projects. It offers free subdomains, 100 MB of free space, FTP upload, predefined scripts, web mail, a search engine and a web chat, with static sites accessible from old devices.
whatpwacando.today
What PWA Can Do Today is a demo site explaining Progressive Web Apps and showcasing live examples of their capabilities. It states that a PWA is a website installable like a native app, able to work offline, send push notifications, and access device hardware such as camera, Bluetooth, and NFC. The site presents over 40 live demos and notes that the app itself is a PWA.
xdaforums.com
Developer forum for Android devices, custom ROMs, mobile software, and device troubleshooting.