As with a lot of these online games Heroes of Newerth has just been converted to freeware (on the 29th July).
Heroes of Newerth (588MB)
In Heroes of Newerth, two teams of up to five players each take on the role of special Hero units. With the assistance of AI-controlled armies, each team sets out with the sole objective of destroying the other team's base. As a match progresses, players can earn experience and gold which can be used to upgrade skills or purchase items to make their character more powerful. The team-oriented design of HoN coupled with unprecedented in-game Voice-Over-IP controls and Clan Support allow for an incredibly deep, tactical team-based experience. This is now Free-To-Play.
Home page:
http://www.s2games.com/
Downloads:
You can download Heroes of NewerthHERE. If you get a small window popping up asking for a password just close it and the download will start. Failing that you may need to create a Fileplanet account (free), but I didn’t when I downloaded the file. You’ll find Mac and Linux versions available too.