I'm working on two different side-projects, and have been for far too long - working may be a bit of a stretch. The first is a CRM for job searchers, turning a must-have from the business world around. The second one is a password/secret manager with audit as a first-class citizen, focused on enterprise sharing and reporting.
I have a "fun" one too, to build a Google Moderator clone as a hosted service. I'm doing that as my intro to Serverless, and will probably do a write-up of how to build and launch on AWS with little/no fixed-cost.