Here are a few I found:
https://www.instructables.com/ with a membership, http://makezine.com/, https://www.vecteezy.com/free-vector/laser-cut, https://www.troteclaser.com/en-us/knowledge/do-it-yourself-samples/, https://www.thingiverse.com/tag:lasercut, https://www.ponoko.com/showroom/product-plans/free, https://www.epiloglaser.com/resources/sample-club.htm, http://www.craftsmanspace.com/free-patterns/laser-cutting-designs.html,