search-n-replace software

[terapp]

I am looking for software that will do the following:

• automatically search/replace term(s) for a folder of 100+ files
• rearrange lists in a random way
• Automatically delete text with certain formatting?
• cloud - show me list of most used words in a group of word documents

If any one knows of software that will do one or any of those I would much appreciate a pointer in where to look for it. Or possibly several different programs?

Thanks!