To keep your installed software always updated and to be informed about fresh new software releases you can visit these best sites:
FileHippo nice boxes with latest updates and popular software, you can also browse the various categories
Softonic browser various categories, find top software, new programs and latest addictions (in spanish)
Softpedia find latest additions by category, probably it has the biggest software archive
Brothersoft browse categories, top free and shareware software, new updated and new releases, there are also games and various channels (wallpapers, widgets, scripts, etc…)
cnet one of most popular site, browse categories, find latest software additions and popular downloads