Docs & Notes

Tools for writing things down, drawing them out, and dealing with the documents other people send — notes, Markdown, diagrams, and two AI office suites.

Obsidian

Personal knowledge management on top of local Markdown files, linked together.

Joplin

Open-source notes with end-to-end encrypted sync, a notebook hierarchy, and an external editor of your choosing.

Markdown

The syntax that works in READMEs, issues, and docs everywhere — and the parts people get wrong.

Mermaid

Diagrams you write as text in a code block — drawings that show up in your diffs.

Excalidraw

A hand-drawn-feel whiteboard, well suited to design discussion and architecture sketches.

GenOffice

An open-source office suite with AI built into the document rather than bolted on beside it — and editing that never leaves your machine.

BatiOffice

One free desktop app for Word, Excel, PowerPoint, HWP, and PDF — with AI editing that reaches the format Korean offices actually use.

imnotai

Stripping the AI tells out of Korean prose without touching a single fact — 70 catalogued patterns, a change-rate hard stop, and an honest …

Book Writer

A Claude Code harness of 11 agents that takes a topic and returns a finished EPUB — research, plan, chapters, fact-check, acceptance gate, …

Univer

An Apache-2.0 SDK for putting real spreadsheets, documents, and slides inside your own product — with a headless Node runtime agents can …