FFmpeg官方技术指导文档，说明了如何使用FFmpeg，并介绍了FFmpeg代码结构及工程信息

文档是Mybatis在github上的官方中文教程文档，很详细的讲解的mybatis的用法。pdf文档是文字版可复制，是我通过工具将官方的中文文档转化为pdf的，如果好用的话，希望大家给个好的评论（好资源就是要分享）

hive官方的文档整理成pdf，通过这个文档，你可以全方位的了解hive的使用和例子。

jvm官方文档

Bash SHELL 中文文档,最权威的中文文档，这个文档是pdf的,做的很精致, 是官方bash指南的中文版,非扫描版. 使用及其方便,是学习linux bash的必备工具书。

Design and Implementation of the lwIP TCP/IP Stack lwip官方文档（英文），lwip移植优化必备 lwIP is an implementation of the TCP/IP protocol stack. The focus of the lwIP stack is to reduce memory usage and code size, making lwIP suitable for use in small clients with very limited resources such as embedded systems. In order to reduce processing and memory demands, lwIP uses a tailor made API that does not require any data copying. This report describes the design and implementation of lwIP. The algorithms and data struc- tures used both in the protocol implementations and in the sub systems such as the memory and bu®er management systems are described. Also included in this report is a reference manual for the lwIP API and some code examples of using lwIP.

Ext官方最新帮助手册中文版 3.0版帮助