[CentOS] Need a little card file database app

I have gobs of notes of tips I have learned here and elsewhere.   many 
of them are in text files, some are in Freemind.

I was thinking I need some sort of card file system that can be searched 
on a couple of keywords like:

Centos TightVNC fonts

And what it takes to setup the sym links to get TightVNC running in 
Centos....


So anyone wish to share their favorite tidbit recording tool?