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This should really be broken up into questions along the lines of "Is X compatible with Lego?" or "Can I make X compatible with Lego?" Otherwise we will get each answer containing overlapping subsets, and we'll likely miss good advice on specific adapters or techniques. In general, we should not be seeking CW questions or answers at this point in the site's lifetime.
– user23
Oct 27, 2011 at 9:12
There are many different patents. The ones for the original bricks expired long ago, as patents expire after 20 years.
This other SE question is relevant to the patent part : "Are companies producing custom molded LEGO pieces legally entitled to do so?" : bricks.stackexchange.com/questions/250/…
I think Joe's got the right idea... As appealing as One Big List might seem, questions on individual products are probably a lot more useful to folks researching the products available to them.
Nanoblocks (not sure, but looks smaller than LEGO, so this might not be compatible)
Note that some of this only produce custom accessories for minifigs, very small sets or exact copies of the official sets, no own really "big" sets like LEGO does
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