As its name says, this tool is meant to help you download games. Don't expect it to allow you to download big budget productions or the expensive releases, as it comes with a library of supported games that you cannot freely customize.
You will have to stick to downloading only the titles from the default list. Anyway, this doesn't mean that this tool is useless or uncool. On the contrary, it has a couple of nice advantages that caught my attention, and I'm someone who owns more than a thousands games on Steam, so don't think I say this lightly. This “Game Downloader” comes with quite a comprehensive list of more than 300 titles, and they're neatly organized by genre into categories like “Real-Time Strategy”, “Roguelike”, “First Person Shooter”, “Puzzle”, “Racing”, and so on.
So if you feel like playing a game from a certain category just run this tool, select that category, and you will find a few interesting suggestions from which you may pick one and download it right away. All the suggested games come with a short description that help you figure out what they're about. You can even filter the games and see only the ones that can be played in a multiplayer mode, the ones that can be played online and the ones that require an account to log in.
The listed games are all free, so you don't have to worry about any additional potentially hidden costs. Even the tool itself is open source, so it doesn't cost any money.
Game Downloader is really easy to use and intuitive. Cutting the long story short, it's a tool that every passionate gamer should consider trying.