OI ConvertCSV is a plugin for OI Notes and OI Shoppinglist to backup and transfer your app data using your own storage provider. The app does not track you, nor does it get or handle any data from you. It comes with support for Blockstack!
OI Timesheet is a web app to keep track of your time.
It keeps your data privately on your device and with the help of your blockstack id also across devices. As a freelancer you can organize your timesheets in projects and share a read-only version with your customer. OI Timesheet is free to use and open source.