mycompiler.io
Online SQL editor for writing and testing SQL queries without setting up a local database.
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storybook.js.org
Storybook is a frontend workshop for building UI components and pages in isolation. It helps developers develop and share hard-to-reach states and edge cases without running the whole app, and supports UI development, testing and documentation. It is open source and free.
systemdesigner.net
System Designer is a learning site offering interactive lessons and case studies on system design. Its Machine Learning Systems section covers building production ML systems, from data pipelines to deployment, with topics such as distributed training, model serving, MLOps monitoring and A/B testing. Lessons are organized into units with stated difficulties and durations.
techbone.net
TechBone provides visual step-by-step guides for devices from brands including Samsung, Apple, Xiaomi and Huawei. The site states it offers over 3,100 interactive guides covering 4,600+ devices, with live simulators for testing menus. Topic hubs cover areas such as connections, SIM management and mobile data.
vpn.techlore.tech
Techlore Chart helps find, check, or use proxy services for alternate web access and privacy testing.
temp-mail.io
temp-mail.io provides temporary or disposable email addresses for quick signups and inbox testing.
temp-mail.org
temp-mail.org provides temporary or disposable email addresses for quick signups and inbox testing.
tempail.com
tempail.com provides temporary or disposable email addresses for quick signups and inbox testing.
mail.re146.dev
TempMail provides temporary or disposable email addresses for quick signups and inbox testing.
tempmaili.com
tempmaili.com provides temporary or disposable email addresses for quick signups and inbox testing.
temporary-mail.net
Temporary-Mail provides temporary or disposable email addresses for quick signups and inbox testing.
temporarymail.com
TemporaryMail.com provides temporary or disposable email addresses for quick signups and inbox testing.
test-ipv6.com
Test IPv6 tests a browser and connection for IPv6 readiness and shows the current IPv4 and IPv6 address. The site requires JavaScript and the ability to pull in cross-site scripts to perform the testing. A simple test offers a quick pass/fail for IPv4, IPv4+IPv6, and IPv6, but provides little diagnostic information.
chris-said.io
A personal blog by Chris Said, a data scientist at Propel. The blog is mostly about statistics, technology, and science, and the site links to blog posts on topics such as A/B testing and statistics.
trashinbox.net
Trashinbox provides temporary or disposable email addresses for quick signups and inbox testing.
osome.iu.edu
Trends Tool helps audit websites, improve search visibility, and monitor SEO or analytics performance.
triticeaetoolbox.github.io
The Triticeae Toolbox hosts public breeding databases for wheat, oat and barley. It includes publicly accessible curated databases for wheat and oat, sandbox versions of these databases for user testing, a private wheat database for approved WheatCAP participants, and discontinued classic versions of the wheat and oat databases containing data up to early 2020.
fakeinfo.net
Generates fictional Twitter profile examples for testing and creative demonstrations.
neilpatel.com
Ubersuggest helps audit websites, improve search visibility, and monitor SEO or analytics performance.
ui.vision
Ui.Vision RPA is an open-source browser and desktop automation tool for building reusable macros. It offers web automation, desktop automation, web scraping, UI testing and test automation, using visual recording, Selenium-style commands or a JavaScript API. The V10 release adds an AI macro assistant and an MCP bridge for connecting AI assistants. The browser extension is available for Chrome, Edge and Firefox.
learning.oreilly.com
Supports software work with AI-assisted coding, testing or application development.
untap.in
Untap.in is a free, browser-based table for play-testing trading card game decks. Users can build decks from card databases, import decklists, play live against opponents, goldfish solo, run drafts, and spectate matches. It runs on desktop, tablet, and phone without downloads and does not enforce game rules.
urtempmail.com
UrTempMail provides temporary or disposable email addresses for quick signups and inbox testing.
v-fonts.com
V-Fonts is a web resource for finding and testing variable fonts. It hosts 377 variable font entries including examples such as Roboto Flex and Helvetica Now Variable, and offers filtering options for decorative, body text, serif, sans-serif, script, designer, character set, and license type. The site requires a browser that supports OpenType font variation technology to display variable font samples correctly, otherwise samples appear as static fonts. It is currently at version 0.2.