The best and only DS Game Maker in development is called 'DS Game Maker'. You can download it from http://www.dsgamemaker.com
In reference to the previous answer (which I have included below), I believe the asker was looking for a product, not an organisation, or else he/she would have put: 'WHO is the best DS Game Maker?'.
Previous Answer: Nintendo, they make all the Pokemon games, with help from game freak, and they also make Mario
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All Nintendo DS are region-free, there is no regional lockout. Any Nintendo DS game will work with any Nintendo DS, and any Nintendo DS game is compatible for multiplayer with another Nintendo DS game, of a different country of origin. I DON'T KNOW!!!!!!!
There is no such thing as a 'DS lite' game. If it's a Nintendo DS game, it works on any model.
The game ID for a Nintendo DS game can be found on the cartridge. There will be a code, which is specific for each DS game.
Yes, Pokemon SoulSilver is a Nintendo DS game so it can be played on a Nintendo DS
No, the Nintendo DS does not have Fruit Ninja