My latest project has been several years brewing. A system of hook together paper pieces that can make all sorts of interesting geometry. I have used it to engage people with mathematics, to teach mathematics and am now making it available to everyone on Kickstarter.
Help me spread the word of this fun math project! It has already been featured in an article by Alex Bellos in the Guardian, and written up by MTBoS regulars Sam Shah, Christopher Danielson and Joe Schwartz.