Epihub - Shopify for tutoring, training, and online schools
LendList - Never again forget what you borrowed from someone and keep track of what your friends borrowed from you (Android app). - raphaelm/lendlist
Traverse - Barcoding solution for small to midsize businesses
You Borrowed It - Keep track of who borrowed what and when you can expect it back
DIY Air Purifier - Build your own air purifier for under $100
Outdoorsy - Find the best RV rental