Developer: Epic Banana
Sometimes it's easy to consider freeware games as inferior to paid releases, for whatever reasons, as if because they're not given a price might mean they're less worth one's time. I've seen and played enough free games to know that a price tag doesn't correlate to a game's quality and in my opinion, the recently released isometric action RPG DataJack is up there with games like Nitronic Rush, Toribash, Stealth Bastard, Zineth, in terms of free games with quality and depth rivaling the best paid releases.
Desura or download it directly here. If you're interested, you can also donate through Paypal on the developer's site.