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Nature Shields Its Own is an archenemy card that allows you to place creature tokens on the battlefield blocking attacking creatures. The rulings on its Gatherer page call out flying as an ability that this card bypasses, so does it also bypass "unblockable" and "can't be blocked"?
Are there any other cards that do that?
Yes, the plant token blocks the creature even if that creature "can't be blocked". A ruling on Nature Shields Its Own's Gatherer page says
The Plant token blocks the attacking creature even if the block couldn't legally be declared (for example, if the attacking creature has flying).
We can find other cards that do this by searching for the wording that Nature Shields Its Own uses: "onto the battlefield blocking". According to this magiccards.info search, there are 3 cards that do this: Ætherplasm, Brimaz, King of Oreskos, and Flash Foliage.
can't be blocked since with the other two you already have to be able to block the creature.