The FileHippo Update Checker is very helpful in finding updates to most of the freeware software you may have on your computer. It has helped me to quickly find and download updates in one browser window as opposed to having to individually open and check each program and then go to each of the individual progam websites to find and download the updates. FileHippo has everything right there on their server.
This update checker does not check for updates to all software, but it checks enough for this to be a rather helpful tool if you use a lot of freeware and/or opensource software. It also displays beta updates to software at the bottom of the window if you are the kind of person who likes to test out beta software. You can disable this if you don't want it to show up. One feature that it lacks that could be potentially helpful is the ability to ignore an update, however this is not a big issue unless you are ignoring several updates that fill up the screen.