TheJudex | Free Knowledge Management & Notes & Open Source Software

Free Limits & Commercial Threshold Matrix

Exact breakdown of quotas, credit card requirements, and commercial allowances before requiring an upgrade.

Tool	Model	Conditions	Free Tier Details	SSO Tax	Action
Obsidian	Freemium	No credit card requiredRestricted to personal / non-commercial useUnlimited usage with no expiration	Uso personal y educativo gratuito ilimitado con acceso a almacenamiento local completo y complementos de la comunidad.	Standard	Try
Kayet	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	100% Free and open source without commercial limits.	Standard	Try
Gemini Exporter	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Acceso libre e indefinido sin limitaciones funcionales ni cobros ocultos.	Standard	Try
Tyler RSS	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	100% Free and open source without commercial limits.	Standard	Try
Bear Markdown Notes	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Acceso completo gratuito a la creación y edición local de notas en Markdown sin límite de tiempo.	Standard	Try
GitBook	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Disponible para espacios públicos y equipos reducidos con acceso a herramientas básicas de edición y publicación.	Single Sign-On Tax (Enterprise SAML)	Try
Logseq	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	100% Free and open source without commercial limits.	Standard	Try
Notion	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Plan gratuito para individuos con creación ilimitada de páginas y bloques, colaboración básica y consultas de IA de prueba limitadas.	Single Sign-On Tax (Enterprise SAML)	Try
ivyNote	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Uso gratuito permanente sin restricciones de tiempo ni requerimiento de tarjeta de crédito para las funciones base local-first.	Standard	Try
Anki	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	100% Free and open source without commercial limits.	Standard	Try
Craft	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Acceso gratuito permanente con limites de almacenamiento y funciones basicas para uso individual en todos los dispositivos compatibles.	Standard	Try
Coda	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Permanent free tier with monthly usage allowances.	Single Sign-On Tax (Enterprise SAML)	Try
Tuta	Freemium	No credit card requiredRestricted to personal / non-commercial useUnlimited usage with no expiration	Incluye 1 GB de almacenamiento, 1 calendario y acceso a aplicaciones móviles y de escritorio.	Standard	Try
Sync	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Ofrece 5 GB de almacenamiento seguro en la nube de forma gratuita e indefinida con funciones estándar de compartición.	Standard	Try
Atlassian	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Nivel gratuito disponible para equipos pequeños con conjuntos de funciones básicos y límites de usuarios.	Single Sign-On Tax (Enterprise SAML)	Try
Xmind	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Incluye creación ilimitada de mapas básicos con marcas de agua y funciones exportadoras estándar restringidas.	Single Sign-On Tax (Enterprise SAML)	Try
DayCarp	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Incluye el cuaderno diario gratuito de forma indefinida tras finalizar la prueba de 7 días del plan Ultimate.	Standard	Try
pCloud	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Hasta 10 GB de espacio gratuito en la nube con tareas iniciales de verificación.	Standard	Try
Lark Suite	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Incluye usuarios ilimitados en el plan base con límites de almacenamiento en la nube y capacidad de videoconferencia estándar.	Single Sign-On Tax (Enterprise SAML)	Try
Dropbox	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Permanent free tier with monthly usage allowances.	Standard	Try
Nuclino	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Permanent free tier with monthly usage allowances.	Standard	Try
Magpie	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Permanent free tier with monthly usage allowances.	Standard	Try
Tucklane	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Permite gestionar un proyecto de forma gratuita con uso comercial permitido.	Standard	Try
Superhuman	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Permanent free tier with monthly usage allowances.	Single Sign-On Tax (Enterprise SAML)	Try
Notejoy	Freemium	No credit card requiredCommercial use allowedMonthly recurring quota reset	Permanent free tier with monthly usage allowances.	Standard	Try
BaseTab	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Extensión gratuita con acceso ilimitado a widgets esenciales y funciones principales de personalización.	Standard	Try
OneDrive	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	5 GB de almacenamiento en la nube sin límite de tiempo.	Standard	Try
Gleanary	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Gratuito y de código abierto, sin coste alguno.	Standard	Try
HackerEverything	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Acceso libre y permanente a todo el directorio indexado de recursos técnicos.	Standard	Try
Canny	Freemium	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Plan gratuito permanente con tableros básicos de feedback y herramientas esenciales.	Single Sign-On Tax (Enterprise SAML)	Try
Savor	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Savor is free on iPhone and Android with no paid plan required while monetization is paused.	Standard	Try
Evernote	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Hasta 50 notas y 1 dispositivo en el plan gratuito básico.	Single Sign-On Tax (Enterprise SAML)	Try
Notedux	Free	No credit card requiredCommercial use allowedUnlimited usage with no expiration	Acceso gratuito permanente completo sin registro ni límites de almacenamiento publicados.	Standard	Try

Audited Free & Freemium Platforms (33)

Obsidian

Freemium

Flexible local Markdown-based application for private knowledge management.

Local plain Markdown storage ensuring absolute data portability
Extensive ecosystem of community-developed plugins and themes
Fully offline functionality with no mandatory external server dependency

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Kayet

FreeOpen SourceApache-2.0

A minimalist, distraction-free text editor for macOS built with Rust and Tauri.

Completely minimalist interface that automatically hides toolbar chrome.
Built in Rust and Tauri for instant startup and low resource usage.
Free and open source with no paywalls or telemetry.

3stars on GitHub

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Gemini Exporter

FreeOpen SourceMIT

Local backup and bulk export for Google Gemini chat history.

100% local browser operation without external server storage
Support for multiple export formats including PDF, Markdown, and JSON
Auditable open-source code requiring no API keys or paid subscriptions

7stars on GitHub

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Tyler RSS

FreeOpen SourceMIT

Free, open-source, lightweight desktop RSS reader with offline article reading.

Completely free and open-source software under the MIT license.
Local data storage and article library powered by SQLite.
Zero application telemetry and no user account requirement.

1stars on GitHub

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Bear Markdown Notes

Freemium

Native Markdown note-taking app for Apple ecosystem with encrypted iCloud synchronization.

Native apps optimized for macOS, iOS, and iPadOS with exceptional offline performance
Flexible organization system using nested tags directly inside notes
Full support for Markdown syntax, Mermaid diagrams, and code syntax highlighting

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GitBook

Freemium

Technical documentation and knowledge platform featuring docs-as-code support and AI assistance.

Native support for docs-as-code workflows with GitHub synchronization
Integrated AI assistant for search and contextual responses
Clean, modern interface optimized for technical reading

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Logseq

Free

Privacy-first, open-source knowledge management platform.

Local architecture ensuring absolute data sovereignty.
Open file formats (Markdown/Org-mode) preventing vendor lock-in.
Extensive ecosystem of community-maintained plugins.

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Notion

Freemium

The connected workspace for notes, docs, wikis, and databases with built-in AI.

High customizability through modular blocks and relational databases.
Generous permanent free tier for individual use and personal projects.
Native AI capabilities built directly into the document workflow.

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ivyNote

Free

Local-first Markdown notes application with cross-device synchronization.

Local-first architecture prioritizing offline speed and direct file access
Native Markdown support with wiki links and interactive graph view
Cross-platform desktop clients for macOS, Windows, and Linux

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Anki

Free

Spaced repetition flashcard software for optimized technical learning.

Highly efficient spaced repetition algorithm for long-term retention.
Full support for multimedia content, audio, images, and LaTeX markup.
Extensive ecosystem of community-developed add-ons.

32.4kstars on GitHub

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Craft

Freemium

Native document and note-taking application focused on speed and fluid design.

Superior native performance without relying on Electron-based frameworks
Full offline support with automated synchronization
Minimalist interface oriented towards a fluid user experience

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Coda

Freemium

An all-in-one collaborative workspace combining documents, spreadsheets, and artificial intelligence.

Combines documents and relational tables in a single interface.
Extensive ecosystem of automations and advanced formulas.
Native integration with artificial intelligence models and external APIs.

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Tuta

FreemiumOpen SourceGPL-3.0

End-to-end encrypted secure email, calendar, and contacts with quantum-safe protection.

End-to-end encryption with quantum-resistant cryptographic algorithms.
Zero-knowledge architecture applied to calendars and contact lists.
Proprietary infrastructure hosted in secure data centers in Germany.

8.1kstars on GitHub

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Sync

Freemium

Secure and private cloud storage with end-to-end encryption.

Zero-knowledge end-to-end encryption for maximum privacy
Advanced permission controls and centralized shared folders
Comprehensive version history and file recovery capabilities

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Atlassian

Freemium

Enterprise software for team collaboration, project tracking, and IT workflows.

Comprehensive suite connecting project tracking, documentation, and code.
Extensive REST APIs and extensive third-party marketplace integrations.
Proven architectural scalability for global enterprise deployments.

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Xmind

Freemium

Mind mapping and visual brainstorming software powered by artificial intelligence.

Multiplatform support covering web, desktop, and mobile devices.
Integrated AI features to automatically structure and expand ideas.
Wide variety of visual templates and diagram structures.

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DayCarp

Freemium

AI note-taking assistant for meetings and daily tasks without joining bots.

Local transcription avoids intrusive meeting bots.
Unified daily page organization for notes, tasks, and ideas.
Desktop apps available for macOS and Windows.

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pCloud

Freemium

Secure cloud storage with advanced encryption and data centers in Switzerland and the USA.

Selectable data center location between the European Union (Switzerland) and the United States
Lifetime one-time payment license option available for individual plans
Zero-knowledge client-side encryption available through the optional pCloud Encryption module

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Lark Suite

Freemium

Enterprise productivity superapp unifying chat, meetings, docs, and project management.

Complete consolidation of communication and office tools into a single application.
Native video conferencing and translation features integrated directly into chat channels.
Generous free tier for teams starting to centralize their operations.

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Dropbox

Freemium

Cloud storage, file synchronization, and document collaboration platform.

High availability and reliability for file synchronization.
Extensive ecosystem of integrations with productivity and AI tools.
Native capabilities for document signing and review workflows.

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Nuclino

Freemium

Unified workspace for knowledge management, documentation, and real-time project tracking.

Minimalist, high-speed interface that minimizes user cognitive load.
Instant search and structuring via board, list, and graph views.
Real-time collaborative editing with a minimal learning curve for new members.

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Magpie

Freemium

Unified visual library for bookmarks and saved items across web and social platforms organized by AI.

Centralizes multiple bookmarking sources into a single visual interface
Automatic AI categorization based on content semantics and color palettes
Local content persistence even when the original post is removed from the source platform

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Tucklane

Freemium

Local app and browser session manager for macOS and Windows workspaces.

Local-first execution keeping user privacy intact.
Unified capture of apps, files, and browser tabs in a single flow.
One-time purchase model without mandatory recurring subscriptions.

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Superhuman

Freemium

AI-powered productivity suite for email, document, and calendar management.

High-performance interface designed for rapid email processing.
Contextual AI agents for writing and task management.
Unified workflows bridging mail, docs, and calendar.

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Notejoy

Freemium

Collaborative note-taking app focused on speed and real-time synchronization.

Fast interface for capturing ideas.
Native integration with office tools like Google Docs and Excel.
Real-time multi-platform synchronization.

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BaseTab

Freemium

Transform your new browser tab into a productive workspace with custom widgets and AI tools.

High degree of modular widget customization.
Direct integration with common developer and productivity tools.
Built-in conversational artificial intelligence assistant.

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OneDrive

Freemium

Cloud file storage and synchronization for individuals and business teams.

Native integration with Windows operating systems and the Microsoft 365 suite.
Advanced security features such as Personal Vault and ransomware detection.
Cross-platform access via mobile and desktop client applications.

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Gleanary

FreeOpen SourceMIT

An agentic personal librarian for macOS with a local-first architecture.

Local-first architecture ensures complete data privacy.
Automatic metadata extraction and Johnny Decimal organization.
Open-source software licensed under MIT.

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HackerEverything

Free

Curated directory of resources recommended on Hacker News since 2007

Comprehensive compilation of technical resources extracted from Hacker News comments since 2007
Structured thematic classification by engineering and technology topics
Free and direct access to recommendations validated by the technical community

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