vbGORE MMORPG Maker
vbGORE is a free, open source MMORPG engine developed in Visual Basic 6 that has been in heavy development for over a year. It supports multiple connections with great speed with support over as many servers as you want. The server offers a lot of security from countless lines of packet integrity checking to streaming packet encryption. The server is backed by a MySQL database for easy editing and much flexibility, allowing you to display your game information on your web site (vbGoreSP can be found on the site which was made by a member to do just this). The client uses DirectX 8 to offer powerful 2d graphic support and manipulation with effects from alphablending, lighting and rotations to even a custom particle engine.
vbGORE includes a fully playable demo game with spells to cast, quests to beat and NPCs to slay so you can see some of what vbGORE has to offer. A lot of what is included will take a bit of digging around to find, though, since theres just too much to see at once.
Sorry, don't want to directly link to the download since the installation can be a bit tricky for those not used to MySQL. If you have any troubles setting up, you can find guides on the main page.
Main site: http://www.vbgore.com/
More game information: http://www.vbgore.com/What_is_vbGORE
Any tips on what you would like to see adding, changed, improved or removed would be nice! : )