Regnum Online is described as 'FREE TO PLAY (F2P) MMORPG that lets you to play with no level or time restrictions. All that's required is that you fight for your realm'. There are more than 25 games similar to Regnum Online for a variety of platforms, including Windows, Android, iPhone, Android Tablet and iPad. The best alternative is World of Warcraft. It's not free, so if you're looking for a free alternative, you could try Runescape or Black Desert Online. Other Regnum Online like games are Guild Wars (Paid), Neverwinter (Freemium), Clash of Clans (Freemium) and Star Wars: The Old Republic (Freemium).
Very successful MMORPG with no monthly fees. PvE and PvP, heavily instantiated. Manageable heroes for your party as well as hero-NPCs. 8-skill-deck and attributes, changeable in every outpost to adjust Skills to play-style, team and preference. Represent entire series of Guild Wars games including Guild Wars, Guild Wars 2.
Runescape is the most popular free MMO in the world, by Jagex Games Studio. Complete quests and win enormous treasures in a 3D world full of magic and monsters- all while never leaving your internet browser.
Black Desert Online is a sandbox, living-world MMORPG. Experience fast-paced, action-packed combat, hunt monsters and huge bosses, fight with friends in a guild to siege nodes and conquer castles, train your life skills such as fishing, trading, crafting, cooking, and much more.
Neverwinter is a free-to-play, action MMORPG based on the acclaimed Dungeons & Dragons fantasy roleplaying game. Epic stories, action combat and classic roleplaying await those heroes courageous enough to enter the fantastic world of Neverwinter!
TERA is the first true action MMORPG, providing all of the depth of an MMO with the intensity and gratification of an action game. Players fully control their characters using the game's dynamic battle system.