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A multi-format notebook for handwriting, PDFs, voice notes, and study documents.

Keep reading notes, quotations, analysis, and source details beside the writing they inform.

An open-source iPad notebook for Apple Pencil writing and PDF markup.

A connected-notes app with a knowledge graph, visual maps, transcription, and an optional AI agent.

Local Markdown notebooks with backlinks, search, and optional self-hosted encrypted sync.

Compare strategy experiments across assets, parameters and historical periods

Build reusable implicit models and prepare geometry for engineering tools

Write and annotate handwritten notes on Android with page layouts, linked notes, and PDF tools.

A Python IDE for creating, running, and debugging projects, notebooks, and data applications.

An open-source notebook for multimedia notes, attachments, and personal reference material.

Semantic component classes and themes for Tailwind CSS

Maintain a balance sheet across investments and ownership structures

Organize transcript codes and trace qualitative themes back to their supporting quotations.

Create a team wiki with collaborative pages, spaces, search, and connected knowledge.

Share columnar in-memory data across languages with a common format and library ecosystem.

Hand-drawn characters assembled from reusable vector parts

Write or sketch by hand, then convert, search, and organize the result.

A self-hosted knowledge workspace that combines wiki pages, databases, ownership, and review trails.

A handwriting notebook that links notes and searches handwriting, Markdown, and PDF text.

Collect notes, links, tasks, and files as visual cards on walls with several views and sharing options.

A browser-installable notes app that stores Markdown files in the user’s Google Drive or Dropbox.

An open-source notebook with a freeform canvas, handwriting, Markdown, and local files.

AI chatbot for your website and chat with any PDF

Online coding assessment platform for AI and ML engineering roles