需求文档开发工具推荐

Visio
将业务，从产品层面肢解开来，做到抽丝剥茧部分与整体统一 
http://dasoft.9553.com/soft/ms-Visio_Premium_2010_SP1_20130318.zip

MindManage
把项目条目化，条理化，目录结构具体规定好
http://download.mindjet.com/Mindjet_11.0.276_EN.exe

Axure
前台结构布局，合理规范的将系统说明白
官方网站：www.axure.com
解压密码：www.portablesoft.org
压缩包MD5：FF338E3A54FD7F912E7846EA42EAA416
http://117.21.189.54/cdn.baidupcs.com/file/ff338e3a54fd7f912e7846ea42eaa416?xcode=04d246ab0e1bf750a4f14ba560ba007866f49868502d500d&fid=587538758-250528-338705602&time=1385005275&sign=FDTAXER-DCb740ccc5511e5e8fedcff06b081203-UOrLrS5ksl3Ha8aobDCfkmbu94M%3D&to=cb&fm=Q,B,T,t&expires=8h&rt=sh&r=426688887&logid=2478980324&sh=1&vuk=4227882950&fn=AxureRPPro_7.0.0.3130_PortableSoft.7z&wshc_tag=0&wsiphost=ipdbm

Word 
穿针织网，把需求综合起来，整理成最终的产品需求文档