A plugin that autolinks a keyword

Hello! I hope you are all well!

I’m looking for a plugin like Cross-Linker that actually works for WP 3.0.1. I’ve tried several of them and they don’t work. What I need is a plugin which can go through all of my articles and hyperlink a specific word.

For example, I may have fifteen articles that mention the keyword “WordPress”. I’d like a plugin which could go through and hyperlink all mentions of that keyword to “http://wordpress.org”.

Any ideas on where I can find such a plugin for WP 3.0.1?

Thanks!