Games that are similar to Sword art online

1.  Tera online

• Open world
• Dual weapon
• Open world PVP
• Action game
• Fantasy game

2.  Dragon nest

• Action game
• Fantasy game
• Nice anime graphics
• Great music
• Flashy effects

3.  Phantasy star online 2

• Action game
• Sci/Fantasy game
• Nice graphics
• Anime style
• Dual sword
• Player housing

Similar to Dragon nest, Phantasy star online is a Dungeon base game but the main difference is other players can participate on your map any time.

4.  RaiderZ

• Action game
• Fantasy game
• Dual sword 
• Open world

5.  Eden eternal

• Fantasy game
• Open world
• Anime style
• Dual wield (true)