http://chatible.io - FB Messenger bot to chat with people anonymously. 400k+ users, processes anywhere between 500k to 5 million messages per day depending on the day. Completely organic growth and can be easily expanded to other platforms and potentially monetized. It was also accepted into Facebook's FbStart program.

http://rubeta.com - SMS Fundraising platform for small nonprofits. The product was completed recently, and I haven't begun marketing it yet. Easy monetization.

Both products can be easily expanded, but unfortunately I haven't found the time to do so. Contact in bio.