Hidden Gems

A virtual whiteboard for sketching hand-drawn-like diagrams. Collaborative, open-source, and runs entirely in the browser with no sign-up required.

An open-source design and prototyping platform that works directly in the browser. It supports vector editing, interactive prototyping, and real-time collaboration.

A free online image editor that supports PSD, Sketch, XD, and virtually every raster and vector format. It runs entirely in the browser with no installation needed.

A color palette generator that lets you create, save, and export harmonious color schemes. It includes tools for contrast checking, gradient generation, and palette extraction from images.

A design tool for creating interactive animations and motion graphics that run in real time on apps and websites. It uses a state machine approach to make animations respond to user input.

A privacy-first, offline-capable knowledge management app that stores data locally and syncs peer-to-peer. It combines notes, tasks, databases, and bookmarks into a single workspace.

A supertag-based workspace that lets you build structured knowledge graphs from everyday notes. It combines outlining, databases, and AI-powered search into one tool.

An AI-powered calendar assistant that automatically schedules tasks, habits, and meetings around your existing commitments. It integrates with Google Calendar and popular task managers.

A cross-platform text expander that detects keywords you type and replaces them with templates, dates, clipboard contents, or even shell command output. It is open-source and works system-wide.

An object-based note-taking app that treats every piece of information as a typed entity such as a person, book, meeting, or project. It builds a personal knowledge graph from your daily notes.

An open-source API development ecosystem that runs in the browser. It supports REST, GraphQL, WebSocket, and real-time testing with a clean, fast interface.

A user-friendly command-line and web-based HTTP client designed for testing and debugging APIs. It uses intuitive syntax, colorized output, and built-in JSON support.

A cloud platform that deploys apps, databases, and cron jobs from a Git repository with zero configuration. It supports dozens of languages and frameworks out of the box.

A high-performance, multiplayer code editor built from the ground up in Rust. It features real-time collaboration, integrated terminal, and GPU-accelerated rendering.

A Swiss Army knife of offline developer utilities including JSON formatting, JWT decoding, hash generation, regex testing, and base64 encoding. It works entirely offline as a desktop app.

An AI-powered search engine that answers questions with cited sources from the live web. It combines large language model reasoning with real-time information retrieval.

An AI voice synthesis platform that generates remarkably natural speech in multiple languages. It can clone voices from short audio samples and offers real-time text-to-speech.

An AI search engine built specifically for developers that answers technical questions with code examples and documentation references. It searches the web in real time and synthesizes programming knowledge.

A tool built on the tldraw canvas that turns hand-drawn wireframes and sketches into working HTML and CSS using AI. You draw a UI, click a button, and get functional code.

A Google AI tool that lets you upload documents, papers, and notes, then ask questions and get cited answers grounded in your own sources. It can also generate audio overviews of your content.

A writing tool that highlights complex sentences, passive voice, adverbs, and readability issues in your text. It assigns a grade level and suggests simplifications to make prose clearer.

An open-source grammar, style, and spell checker that supports over 30 languages. It integrates with browsers, email clients, and text editors via extensions and plugins.

An open-source publishing platform built for professional bloggers, newsletters, and membership sites. It includes a modern editor, built-in SEO, email newsletters, and paid subscription support.

A free citation generator that creates properly formatted references in APA, MLA, Chicago, and hundreds of other styles. It can auto-fill citation details from a URL, DOI, or ISBN.

A Markdown-based authoring framework created by Stripe for building custom documentation sites. It extends Markdown with tags, variables, and functions while keeping content readable as plain text.

An interactive learning platform for math, science, and computer science that teaches through guided problem-solving rather than lectures. Each lesson builds intuition through visual, hands-on puzzles.

A free, open-source platform for learning programming through practice and mentorship. It offers exercises in over 65 languages with automated analysis and human code review.

An interactive coding education platform where you can pause video tutorials and edit the code directly inside the screencast. It covers front-end development, React, and other web technologies.

A collection of interactive visual explanations for complex mathematical and statistical concepts like eigenvalues, regression, and Markov chains. Each topic uses animated, manipulable diagrams.

A community-driven platform offering detailed visual roadmaps for learning various technology skills like frontend, backend, DevOps, and AI. Each roadmap links to curated free resources for every topic.

A code-driven business intelligence tool that lets you build polished data reports and dashboards using SQL and Markdown. It generates static sites from your queries, making reports fast and easily shareable.

An open-source tool for exploring and publishing data stored in SQLite databases. It instantly turns any dataset into an interactive, searchable, API-enabled website.

An open-source data visualization framework that creates complex charts from tabular data without coding. It supports uncommon chart types like alluvial diagrams, beeswarm plots, and treemaps.

A modern spreadsheet with built-in Python, SQL, and AI capabilities that runs in the browser. It combines the familiarity of a grid interface with the power of code-based data analysis.

A collaborative platform for building interactive data visualizations and dashboards using JavaScript notebooks. It provides reactive cells that update in real time as data or code changes.

An open-source scheduling platform that lets people book meetings based on your real-time availability. It integrates with multiple calendars, video platforms, and payment processors.

An open-source team chat application that organizes conversations by topic threads within channels. It combines the immediacy of chat with the structure of a forum.

A video messaging tool that lets you record your screen, camera, or both and instantly share the recording via a link. It includes features like viewer analytics, comments, and auto-generated transcripts.

A browser extension and web app that aggregates developer news, blog posts, and articles from hundreds of sources into a personalized feed. It learns your interests and surfaces relevant technical content.

A browser-based video meeting platform that requires no downloads or accounts for guests. It provides permanent meeting rooms with customizable URLs and built-in recording.

A decentralized, open-source music streaming platform that lets you host and share your own music library. It supports federation through ActivityPub, letting independent servers share content.

A media center application that aggregates streaming content from multiple services into a single interface. It uses community-built add-ons to organize movies, shows, and live TV from various sources.

A video and podcast editor that lets you edit media by editing text. It transcribes your content and allows you to cut, rearrange, and overdub by simply modifying the transcript.

A cross-platform podcast player with powerful organization features including filters, playlists, and variable playback speed. It syncs listening progress across all your devices seamlessly.

A musical time machine that lets you listen to music from any country and any decade from the 1900s to today. You pick a spot on the world map and a time period, and it plays curated songs from that era and place.

An open-source personal finance and wealth management app that tracks your net worth, investments, and spending. It aggregates all accounts into a single dashboard with detailed analytics.

An open-source, local-first personal budgeting app inspired by YNAB's envelope budgeting method. It runs on your own device or server with optional sync across machines.

A financial platform for sending money internationally at the real exchange rate with transparent, low fees. It also offers multi-currency accounts and debit cards for spending abroad.

A suite of tools for backtesting investment portfolios, analyzing asset allocation, and running Monte Carlo simulations on retirement plans. It uses historical market data to model portfolio performance.

A free financial data platform that provides stock screeners, financial statements, earnings data, and analyst estimates for thousands of companies. It presents institutional-grade data in a clean, ad-light interface.

An open-source password manager that stores and auto-fills credentials across all devices and browsers. It supports two-factor authentication, secure sharing, and self-hosting.

An email alias service that lets you create unlimited aliases that forward to your real inbox. You can reply from aliases, block them individually, and use them for sign-ups to prevent spam.

An end-to-end encrypted collaborative office suite that includes documents, spreadsheets, presentations, forms, and kanban boards. The server never sees your content in plaintext.

A privacy-focused VPN service that requires no email, name, or personal information to sign up. It uses account numbers instead of accounts and accepts anonymous payment methods including cash.

A free service that checks whether your email address or phone number has appeared in known data breaches. It aggregates billions of leaked records and lets you set up alerts for future breaches.

A meditation and sleep app with over 200,000 free guided meditations, music tracks, and talks from mindfulness teachers worldwide. It includes a customizable timer for unguided practice.

A nutrition tracking app that provides detailed micronutrient data for everything you eat, covering over 80 vitamins, minerals, and amino acids. It uses verified, lab-analyzed food data rather than user-submitted entries.

An AI-powered mental health chatbot grounded in cognitive behavioral therapy principles. It guides users through mood tracking, thought reframing, and therapeutic exercises via conversational interaction.

An open-source fitness tracker and workout manager that lets you create routines, log exercises, and track body measurements. It includes a built-in exercise database with images and nutritional tracking.

A gamified sleep habit app where you plant a virtual building at bedtime and it grows overnight if you do not use your phone. Consistent sleep schedules build a virtual town over time.

An invite-only, technology-focused link aggregation and discussion community. It features transparent moderation, mandatory story tagging, and a tree structure that shows how the community grew.

A visual bookmarking and research platform where users organize ideas, images, links, and text into interconnected channels. It functions as a collaborative mood board and knowledge garden.

A federated, open-source link aggregator and discussion platform similar to Reddit. It uses ActivityPub, meaning independent servers can communicate with each other and the broader fediverse.

A professional networking platform that lets you showcase all your work and interests, not just job titles. It supports a timeline of projects, side hustles, collaborations, and achievements.

A platform for finding and organizing local in-person and virtual events around shared interests. It covers tech meetups, book clubs, hiking groups, language exchanges, and thousands of other topics.

An open-source, cross-platform file manager that unifies files from local drives, cloud services, and network storage into one interface. It creates a virtual distributed filesystem across all your devices.

An online file conversion service supporting over 200 formats including documents, images, video, audio, and ebooks. It processes files in the cloud and deletes them after conversion.

An open-source, peer-to-peer file synchronization tool that keeps folders in sync across multiple devices without a central server. All data is encrypted in transit and never stored on third-party infrastructure.

A web-based file manager that connects to any storage backend including S3, SFTP, FTP, Google Drive, Dropbox, and WebDAV. It provides a unified browser interface with file preview and editing capabilities.

An end-to-end encrypted file sharing service that lets you send files up to 5 GB with no account required. Links can be password-protected and set to expire automatically.

A collection of over 3,000 free online calculators covering math, physics, finance, health, construction, cooking, and more. Each calculator includes explanations of the underlying formulas and concepts.

A disposable email service that generates a temporary inbox for receiving emails without registration. The inbox self-destructs after a set period, leaving no trace of your activity.

A URL shortening service that converts long links into compact, shareable URLs with optional custom aliases. It has been operating reliably since 2002 and requires no account for basic use.

A tool for creating beautiful images of your source code with syntax highlighting, custom themes, and export options. It supports dozens of languages and produces shareable screenshots instantly.

An online playground for the jq command-line JSON processor that lets you test queries against sample data in real time. It provides syntax highlighting, auto-formatting, and shareable links to your queries.