Intel's AppUp Center is a client that makes it easy to browse a catalogue of applications, then buy, install and run them on your netbook, laptop or PC.
There are all kinds of apps on offer here: games, translation tools, simple utilities, photo editors, stock managers, weather monitors, and much, much more. Fortunately a keyword search helps you quickly zoom in on what you need, and you can also browse the apps by category, release date, popularity or rating.
Select something that looks interesting and you can then often read reviews on it from other AppUp Center users, helpful in picking out the hits from the duds.
Most of the apps are commercial, but there are plenty of free examples too. You'll need to create an AppUp Center account before you can download these, but there's no need to provide any credit card information immediately: just your name and email address will allow you to download free apps. And when you do they'll appear in a central My Apps panel, from where you can launch, update or uninstall them in just a couple of clicks.
Please note, you'll need Adobe AIR Runtime installed for some of the apps to work. Leave the "Get Adobe AIR Runtime" box checked at the end of the installation process and a browser window should open at the relevant download page for you.