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Codex 橙皮书：从安装到实战案例的全链路 Codex 使用指南（非官方开源，含可下载 PDF）

Crosspoint Reader is designed to simplify the process of reading and managing documents, providing users with an intuitive interface to organize and access their reading materials efficiently. It aims to enhance productivity by allowing users to focus on content without the distractions often found in traditional reading environments.

An intuitive online editor that allows users to write and edit code easily, offering a seamless experience for both beginners and experienced developers. It provides a collaborative environment for creating projects while simplifying the coding process.

Free and open-source PDF editor for Windows. View, annotate, OCR, merge, split, edit text, draw, sign, fill forms, print, flatten, and open password-protected PDFs without a subscription. Install or run portable. GPLv3

A fast, helpful, and open-source document parser

别再问我什么是 Loop Engineering — 橙皮书系列。A plain-language guide to loop engineering (中文 + English PDF). Free.