Grep is RSS feed searcher and cacher. It's mostly useful with web sites that provide search results as RSS feed. If they include full content in feeds even better. One exaple of such web service is SocialText wiki for which Grep was originally written.

I know that I wrote it in some wiki workspace, but where ?!

For now, here is a feature list:

• cache all results locally, great for off-line use
• supports credential spoofing using Cookies (useful to login into protected areas)
• comes with easy bookmarklet subscribe helper
• written using Jifty and Lucene

Source code is in development Subversion repository