My basic thoughts on browsing boil down to what I'm really looking to do. Usually if I'm just browsing, I'm looking for things that might help me be more productive. That's usually hard for me to put my finger on to look for search terms. The ways that I usually find something is through people making suggestions.
On a website like GCentral that could mean things like:
high ratings
suggestions from people we might "follow"
newly added projects
most downloads
projects that have as dependencies of tools I already have installed
whether there is a video tutorial link.
Those are all ways that I would be likely to try something. So I would probably like to see a mix of things show up on the front page when just browsing. If I also assume that there might be some form of website cookie associated with browsing on GCentral, keeping track of whether I've seen the suggestions before, to keep some percentage of new things rotating through the top of the list would be helpful.
Those are just my initial thoughts. I hope that helps.