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I'm trying to find all the competitors to LEGO. I know there is MegaBloks. What are some more?

The base idea is that they should be bricks and they need to connect to each other like LEGO. However, it does not need to be compatible with LEGO.

Also open source designs are always welcome!

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3 Answers 3

Disclaimer: some of these retrieved from the lugnet off-topic/clone-brands group; they also mention "Art Asylum’s C3 Brand" but the site doesn't seem to work.

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Perhaps I phrased my question a little off. I want to know if there's any LEGO like bricks that's not compatible with LEGO. –  Pwnna Oct 4 '12 at 0:26
Both questions have merit, so you may want to edit your original question to ask for both. –  Joubarc Oct 4 '12 at 4:43

In terms of semi/incompatible systems, there's a number of them that are supported through the Free Universal Construction Kit files for MakerBots and other 3D printers:

The Free Universal Construction Kit offers adapters between Lego, Duplo, Fischertechnik, Gears! Gears! Gears!, K’Nex, Krinkles (Bristle Blocks), Lincoln Logs, Tinkertoys, Zome, and Zoob.

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LEGO-like, but not compatible? Nano Blocks. http://www.mynanoblock.com/site/

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