Useful websites and free online tools worth bookmarking
These are the sites people keep coming back to: small, free tools that do one job well, and a few bigger ones that are worth knowing about. Every one was shared by a NexURLs member and kept because others found it useful too.
Simon Willison's Weblog
simonwillison.net · Tech & AI
Simon Willison's Weblog is a personal blog focused on technology and coding. Visitors can gain insights into programming, AI, and software development trends.
- Read about the evolution of Dwarf Fortress' version control
- Explore updates on Python and GitHub Actions
- Discover insights on AI and cryptography discussions
Landingfolio
landingfolio.com · Business & Startups
Landingfolio is a curated gallery of landing page designs, templates and components. Someone would visit to find high-quality landing page examples and templates for design inspiration.
- Browse curated real landing page examples
- Find templates and component examples
- Get new landing page inspiration weekly
Flippa
flippa.com · Business & Startups
Flippa is a global marketplace and exit platform for buying and selling online businesses, including websites, SaaS, eCommerce stores, apps, and YouTube channels. People visit to list, value, and manage exits with broker support, AI-powered tools, and access to a large pool of verified buyers.
- Get an AI-informed valuation range for your business
- Create professional P&L and Confidential Information Memoranda quickly
- Connect with verified buyers and work with dedicated brokers
Ollama
ollama.com · Tech & AI
Ollama allows users to run and build with open AI models. It's ideal for those seeking privacy and ease of use on multiple operating systems.
- Run AI models locally or in the cloud
- Access the latest open models
- Ensure privacy with no data storage
Hugging Face
huggingface.co · Tech & AI
Hugging Face is a platform for collaboration in artificial intelligence and machine learning. Users can access models, datasets, and tools to advance their AI projects.
- Collaborate on unlimited public models and datasets
- Access 45,000+ AI models through a unified API
- Train and deploy models with enterprise-grade solutions
What are the best wireless earbuds with long battery life?
kyptec-lifestyle.com · Tech & AI
This is Kyptec LifeStyle's product collection page for Bluetooth earphones, highlighting features like Hybrid ANC, ENC calls, deep bass, long battery life, and fast charging. Someone would visit to browse and compare Kyptec wireless earbuds designed for music, calls, gaming, travel, workouts, and everyday use.
- Shop models with Hybrid ANC and ENC for noise control
- Find earbuds with long battery life and fast charging
- See options tuned for music, calls, gaming, and workouts
My App and Database Setup
github.com · Business & Startups
This GitHub repository provides a setup for managing multiple apps on a single server. Users can streamline their app deployment and management with a unified dashboard and reduced costs.
- Deploy multiple apps on one server you control
- Choose between managed or self-hosted options
- Access a unified dashboard for all services
LEANSTACK
leanstack.com · Business & Startups
LEANSTACK provides tools, training, and AI for founders based on the Lean Canvas methodology from Ash Maurya. Someone would visit to learn validated startup practices and use AI tools to test and track business-model experiments.
- Use the 1-page Lean Canvas business model
- Run AI-powered startup validation and experiment tracking
- Access books, essays, and the LEAN 1-2-3 newsletter
Trends.vc
trends.vc · Business & Startups
Trends.vc is a founder-focused newsletter and private community that publishes quick market reports on trends like AI and crypto. People visit to get concise 5-minute reports, join a private founder community, and access paid Pro reports and memberships.
- Read free 5-minute trend reports on AI, crypto and more
- Join a private community of founders and topic channels
- Upgrade to Trends Pro for full access to reports
Marketing Help for My Waitlist
meetmarv.org · Business & Startups
Marv is a Windows companion that assists you while you work. You might want to visit to join the early-access waitlist and experience its features.
- Join the early-access waitlist
- Get on-screen assistance while working
- Use voice commands for hands-free help
Growth.Design Case Studies
growth.design · Business & Startups
Growth.Design offers in-depth case studies on user experience design. Visitors can learn how top companies create engaging products.
- Explore UX case studies from major companies
- Learn practical UX tips and strategies
- Understand psychological principles in design
Starter Story
starterstory.com · Business & Startups
Starter Story is a resource for discovering real, profitable business ideas. Visitors can explore detailed breakdowns of successful projects and learn from real founders' experiences.
- Explore 3,232+ revenue-generating business projects
- Read in-depth interviews with real founders
- Get weekly founder-tested business ideas in your inbox
PCjs Machines
pcjs.org · Tech & AI
A site hosting JavaScript-based emulators of vintage PCs, microcomputers, calculators, terminals, and arcade machines that run in a web browser. Visit to run historical operating systems and software (DOS, Windows, OS/2, etc.) and access an archive of related software and documentation.
- Run vintage OSes and applications in-browser
- Browse an archive of historical software and documentation
- Explore and contribute via the PCjs GitHub project
KiwiDesk - Community Project Update
kiwidesk.kiwicanopy.com · Business & Startups
KiwiDesk is a window manager for Mac that organizes your open apps. It's designed to simplify window management, making your workspace tidy and efficient.
- Arrange windows automatically without manual adjustments
- Assign shortcuts for quick app access
- Free to use and easy to install
Logo and Icon Creator Tool
designminis.com · Tools
This site offers a tool for creating logos and icons. Users can design, animate, and export their creations easily.
- Draw shapes and pictograms on grids
- Animate your designs
- Export your creations easily
Failory
failory.com · Business & Startups
Failory provides insights from startup failures and successes. It's a resource for founders to learn and improve their ventures.
- Read 200+ interviews with startup founders
- Subscribe to a weekly newsletter
- Access step-by-step guides on strategies
remove.bg
remove.bg · Tools
Remove.bg is a tool that automatically removes image backgrounds in seconds. It's perfect for anyone needing quick, professional-looking images for various projects.
- Upload photos to remove backgrounds instantly
- Create transparent PNGs for logos
- Edit backgrounds for e-commerce and headshots
Wokwi
wokwi.com · Tech & AI
Wokwi is an online simulator for IoT and embedded systems supporting ESP32, STM32, Arduino, Raspberry Pi Pico, peripherals and WiFi. People visit to design and simulate circuits and microcontroller projects in the browser and optionally turn digital-chip designs into real silicon via Tiny Tapeout.
- Simulate microcontrollers, sensors, displays, motors and WiFi in-browser
- Use for classroom assignments and university coursework
- Export chip designs for fabrication through Tiny Tapeout
512GB of RAM on ONE Stick
youtube.com · Tech & AI
The video discusses Micron's development of a 512GB RAM stick and its implications. Viewers will learn about the technology behind it and its potential impact on computing systems.
- Micron is producing 512GB RAM sticks.
- Runs at 9,200 mega transfers per second.
- Uses vertically stacked DRAM technology.
AI Image Detector for Kate Middleton Video
isitai.com · Tech & AI
This site offers a free AI image detector to check if images are AI-generated. Users can quickly analyze images for authenticity with high accuracy and no signup required.
- Upload images or URLs for analysis
- Check up to 5 images at once
- Get detailed results in under 3 seconds
Have I Been Pwned
haveibeenpwned.com · Tools
Have I Been Pwned is a service to check if your email has been involved in data breaches. Users can monitor their email security and receive notifications about new breaches.
- Search for breaches using your email address
- Get alerts for future data breaches
- Monitor corporate domains via API
Marketur: Find opportunities & build with WordPress tools
marketur.net · Tech & AI
Marketur offers WordPress plugins, tools and services that the creator built and uses on their own sites to run chat, community, email, mobile apps and AI integrations. Visit to find off-the-shelf plugins you can install on your WordPress site, hire the team to build or maintain your site, or join the affiliate program to earn commissions.
- Install chat, community, email and PWA plugins on your WordPress site
- Use Marketur MCP to let AI assistants safely edit your site
- Get site builds, monthly care plans and an affiliate program
Shopify Name Generator
shopify.com · Business & Startups
A free AI-powered tool from Shopify that generates business name ideas and checks domain availability instantly. Visit to quickly produce and evaluate brand name options and secure a matching domain.
- Generate AI business name ideas from one keyword
- Check domain name availability instantly
- Compare and pick brandable names for your store
Hackaday
hackaday.com · Tech & AI
Hackaday is a technology blog publishing daily projects, hardware hacks, and engineering news. Visit to read detailed maker projects, hardware analysis, and community updates.
- Browse daily hardware and maker project write-ups
- Read engineering analysis and security or kernel coverage
- Follow community project logs and comments
Freepik AI
freepikai.app · Tech & AI
Freepik AI is an online workspace for generating and editing images, videos, voiceovers, and 3D models using text prompts or uploaded references. Someone would visit to create or prepare visual and audio assets (image generation, photo edits, videos, talking avatars, and 3D exports) and try the tools for free before choosing a paid plan.
- Generate images or edit photos from prompts or uploads
- Create videos from images, motion references, or talking avatars
- Export audio voiceovers and interactive 3D models for projects
Whistle: Speech to Text in 16.9 MB
cactuscompute.com · Tech & AI
Whistle is an open speech recognition model for various devices. Users can transcribe audio in multiple languages quickly and efficiently.
- Transcribe audio in seven languages
- Get word timestamps with probabilities
- Embed audio without decoding a transcript
First Round Review
firstround.com · Business & Startups
First Round Review offers tactical advice for startup founders and leaders. It's a valuable resource for actionable insights and strategies to build and grow startups.
- Access 600+ articles on startup building
- Subscribe for fresh weekly content
- Learn from experienced founders' firsthand stories
Mixergy
mixergy.com · Business & Startups
Mixergy offers interviews and courses with experienced entrepreneurs sharing business and startup advice. People visit to learn practical strategies and structured programs for starting, automating, and growing businesses.
- Watch interviews and courses from proven entrepreneurs
- Follow curated programs for starting and systemizing a business
- Access collections focused on SaaS, selling physical products, and increasing sales
StackEdit
stackedit.io · Tools
StackEdit is a full-featured, open-source Markdown editor with live preview and sync features. People visit to write, edit, collaborate on, and publish Markdown documents with offline support and integrations.
- Real-time scroll-synced preview of Markdown output
- Sync and publish via Google Drive, Dropbox, GitHub, Blogger, WordPress
- Collaborative editing with inline comments and merge support
Pixlr X
pixlr.com · Tools
Pixlr X is a free, browser-based AI photo editor for quick professional and creative image edits without installs. You'd visit to edit photos, remove or replace backgrounds, and use AI tools like generative fill and upscaling directly in your browser.
- One-click background removal and transparent image export
- Generative tools: fill, expand, transform, and create avatars
- AI-enhanced fixes: upscale, sharpen, denoise, and HDR mimic
Explain That Stuff
explainthatstuff.com · Tech & AI
Explain That Stuff is a free, illustrated online book of over 400 easy-to-understand science and technology articles by Chris Woodford. Visit to get clear, human-written explanations of how things work, STEM topics, and teaching resources for learners and educators.
- Browse 400+ illustrated articles on science and technology
- Find topics via A-Z, timeline, search, random, or teaching guide
- Use content to support STEM learning and homeschooling
MDN Web Docs
developer.mozilla.org · Tech & AI
A comprehensive reference site documenting web technologies like HTML, CSS, JavaScript, and Web APIs. Developers visit to learn standards, find API details, and get practical guidance for building web and progressive web apps.
- Browse detailed docs for HTML, CSS, JavaScript, and Web APIs
- Read implementation notes and browser compatibility data
- Follow tutorials and examples for modern web features
Transformer Explainer
poloclub.github.io · Tech & AI
An interactive visualization that explains how Transformer models (like GPT-2) operate and process text. Someone would visit to see step-by-step descriptions and visualizations of tokenization, embeddings, self-attention, and Transformer blocks to learn how LLMs predict next tokens.
- Visualize tokenization and token IDs
- Explore embeddings and positional encodings
- Step through multi-head self-attention computations
Experiments with Google
experiments.withgoogle.com · Tech & AI
A curated gallery of interactive projects and tools showing experiments built with web, mobile and AI technologies. Visit to browse creative, educational and technical demos and find resources to inspire your own experiments.
- Browse categorized collections of AR, VR, AI and web experiments
- Find tools and resources for building similar projects
- See weekly additions and archived experiments for inspiration
Building Games with OpenAI's Code Model
andrewmayneblog.wordpress.com · Tech & AI
A blog post showing experiments using OpenAIu2019s code-davinci model to generate entire games and small apps from natural-language prompts. It explains several demo projects, links to playable CodePen examples, and notes strengths and limitations of the model.
- Play multiple demo games on CodePen
- See the exact generated code for each example
- Learn prompt patterns and limitations for code generation
Animated ASCII Art Tool
ascii.rest · Tools
This site offers 217 animated ASCII art pieces for web pages. It's a great resource for developers looking to enhance their projects with unique visuals.
- Access 217 animated ASCII art pieces
- Convert images to animated ASCII
- Create custom banners for README files
JSFiddle
jsfiddle.net · Tech & AI
JSFiddle is an online code playground for testing web development projects. Users can experiment with HTML, CSS, and JavaScript in a collaborative environment.
- Test React, Tailwind, JavaScript, CSS, HTML online
- Create and manage private collections of fiddles
- Access pre-released features before public launch
Stratechery
stratechery.com · Tech & AI
Stratechery offers insights on technology's business and strategic impact. Visitors can explore in-depth articles and interviews about tech's role in politics and society.
- Read articles on technology's impact on business
- Listen to interviews with industry experts
- Stay updated with weekly summaries of content
TinyPNG
tinypng.com · Tools
TinyPNG is a free online image optimizer that reduces image file sizes while maintaining quality. Users can enhance website performance and loading speeds by compressing images efficiently.
- Compress up to 20 images at once
- Convert images to WebP format easily
- Integrate with your workflow using the API
Chroma 1.0: Speech-to-Speech Model
flashlabs.ai · Tech & AI
A platform for deploying autonomous voice agents built on Chroma speech-to-speech models and RAG systems. It connects agents to your vector database and knowledge graph for accurate, real-time responses.
- Deploy voice agents powered by Chroma models
- Connect agents to a vector database and knowledge graph
- Enable real-time, retrieval-augmented responses
Questions people ask
What are the most useful websites to bookmark?
Start with the top of this list. They are the tools NexURLs members liked and saved the most, with a short summary of what each one does.
Are these tools free?
Most are free or have a free version. The summary for each one notes what you can do there.
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