Version checker. Has anyone else had this issue?

Version checker. Has anyone else had this issue?

In my work environment, we use a lot of open source. What we would like to do is automatically scan for apps that we use and get notified when they get updated. Seems like there should be a service somewhere that tracks versioning info and could notify us when a package changes. Something like an open source versioning XML feed maybe? Anyone know of such a creature? Nikki