Developer Tool - 1. Text Tool and GNU/Linux Tool

Below two links list famous tool about text processing and provide a good category. And it will give a overview about text tool:

http://www.shlomifish.org/open-source/resources/text-processing-tools/ 

http://tldp.org/LDP/GNU-Linux-Tools-Summary/html/text-related-tools.html

Other interesting links I found unexpectedly when I trying to search text tool:

GNU/Linux Tool:

http://tldp.org/LDP/GNU-Linux-Tools-Summary/html/index.html

Unix Power Tool:

http://docstore.mik.ua/orelly/unix3/upt/index.htm

Awk & Sed:

http://docstore.mik.ua/orelly/unix3/sedawk/index.htm