Daimonin is a MMORPG with isometric graphics best played in 800x600 resolution. The game has nice detailed graphics and background music. You can play a male or female human, half-elf, elf, dwarf or ogre with pierce, slash, impact or cleave attacks. You start at the mercenary guild hall in the human plane, later you can become a priest or join the magician guild in the demon plane. Your main mission is to prevent the creatures of Moroch to further infiltrate human plane and push them back to demon plane by killing as much of them as possible, but there are also some missions that are not fighting based, like collecting apples for making tasty cider. Daimonin is not only a game. It is also a community-driven open-source GPL-licensed project, as such it is possible to fork and extend Daimonin, but only the source code is GPL-licensed. As such, game content and story is excluded from the GPL. View a YouTube demo here.
emerge --ask games-rpg/daimonin-client
Freedroid RPG is an RPG with isometric graphics. In it, the player is Tux, who must fight rebelling robots in order to restore peace to humankind. To do so,Tux may take over robots in a minigame based off the classic game Paradroid, or may simply blast them to pieces with a weapon. View a YouTube demo here.
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Summoning Wars is an open-source role-playing game, featuring both a single-player and a multiplayer mode for about 2 to 8 players. You start in a prison and will make your way through a magic world full of dangerous creatures and demons as you level your character. The game has a plot and fights are in real-time, a bit of hack&slay and old school RPG style mixed. View a YouTube demo here.
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The Mana World
The Mana World (TMW) is a serious effort to create an innovative free and open source MMORPG. TMW uses 2D graphics and aims to create a large and diverse interactive world. View a YouTube demo here.
The recommended client for playing is ManaPlus.
emerge --ask games-rpg/manaplus